Add common -2x+-5x=-7x+8
-7x+8
Answer:
The mass of a substance that passes per unit of time is called the mass flow rate, the unit of mass flow rate is kilogram per second in SI units.

Step-by-step explanation:
Consider the provided information.
We need to Define mass and volume flow rates and how they are related.
The mass of a substance that passes per unit of time is called the mass flow rate, the unit of mass flow rate is kilogram per second in SI units.
The volume of fluid which passes per unit time is called volume flow rate.
The relation between them is:
The Mass flow rate = Density × Volume flow rate
Or

Where ρ is the density.
Answer:
2x -4 -1 +x
Step-by-step explanation:
The number will be equal to 11.67.
<h3>What is an expression?</h3>
Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication and division.
The expression will be formed from the given data. Let the number be x so the expression will be:-
3x - 7 = 28
3x = 35
x = 35 / 3
x = 11.67
Therefore the number will be equal to 11.67.
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A system of equations may have a single unknown to varying multiples of unknowns , as much the number of unknowns increases , that much system of equations are also built up , else , it can't be resolved