3 (x + 2) + 4(x - 5) = 10
Simplify.
3x + 6 + 4x - 20 = 10
Add like terms.
(3x+4x) + (6-20) = 10
Simplify.
7x - 14 = 10
Add 14 to both sides of the equation.
7x = 24
Divide both sides by 7 so that X is by itself.
x = 24/7, or 3 3/7
~Hope I helped!~
With process of elmination the answer is C because all the rest are the same number but placed it is different order.
~JZ
Answer: If you look up the question on Brainly, somebody asked the same question and there is a full explanation.
Step-by-step explanation:
12%=(3+10%*x)/(20+x)
x=30
add 30 pounds of the second alloy
