5x+2x+-9=40

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Solution for 5x+2x+-9=40 equation: 


Simplifying
5x + 2x + -9 = 40

Reorder the terms:
-9 + 5x + 2x = 40

Combine like terms: 5x + 2x = 7x
-9 + 7x = 40

Solving
-9 + 7x = 40

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + 7x = 40 + 9

Combine like terms: -9 + 9 = 0
0 + 7x = 40 + 9
7x = 40 + 9

Combine like terms: 40 + 9 = 49
7x = 49

Divide each side by '7'.
x = 7

Simplifying
x = 7

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