31=7x+3x-9

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Solution for 31=7x+3x-9 equation:


Simplifying
31 = 7x + 3x + -9

Reorder the terms:
31 = -9 + 7x + 3x

Combine like terms: 7x + 3x = 10x
31 = -9 + 10x

Solving
31 = -9 + 10x

Solving for variable 'x'.

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

Add '-10x' to each side of the equation.
31 + -10x = -9 + 10x + -10x

Combine like terms: 10x + -10x = 0
31 + -10x = -9 + 0
31 + -10x = -9

Add '-31' to each side of the equation.
31 + -31 + -10x = -9 + -31

Combine like terms: 31 + -31 = 0
0 + -10x = -9 + -31
-10x = -9 + -31

Combine like terms: -9 + -31 = -40
-10x = -40

Divide each side by '-10'.
x = 4

Simplifying
x = 4

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