Answer:
x = -1/7
Step-by-step explanation:
Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.
PEMDAS =
Parenthesis
Exponents (& Roots)
Multiplication
Division
Addition
Subtraction
& is the order of operation.
First simplify the expression to the left: -10 + 5 = 5 - 10 = -5
-5 = 7x - 4
Next, isolate the variable, x. Do the opposite of PEMDAS. Add 4 to both sides:
-5 (+4) = 7x - 4 (+4)
-5 + 4 = 7x
-1 = 7x
Divide 7 from both sides:
(-1)/7 = (7x)/7
-1/7 = x
x = -1/7
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