-13=10x-13x+21-31

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Solution for -13=10x-13x+21-31 equation:


Simplifying
-13 = 10x + -13x + 21 + -31

Reorder the terms:
-13 = 21 + -31 + 10x + -13x

Combine like terms: 21 + -31 = -10
-13 = -10 + 10x + -13x

Combine like terms: 10x + -13x = -3x
-13 = -10 + -3x

Solving
-13 = -10 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-13 + 3x = -10 + -3x + 3x

Combine like terms: -3x + 3x = 0
-13 + 3x = -10 + 0
-13 + 3x = -10

Add '13' to each side of the equation.
-13 + 13 + 3x = -10 + 13

Combine like terms: -13 + 13 = 0
0 + 3x = -10 + 13
3x = -10 + 13

Combine like terms: -10 + 13 = 3
3x = 3

Divide each side by '3'.
x = 1

Simplifying
x = 1

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