8+7=x-4x

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Solution for 8+7=x-4x equation:


Simplifying
8 + 7 = x + -4x

Combine like terms: 8 + 7 = 15
15 = x + -4x

Combine like terms: x + -4x = -3x
15 = -3x

Solving
15 = -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.
15 + 3x = -3x + 3x

Combine like terms: -3x + 3x = 0
15 + 3x = 0

Add '-15' to each side of the equation.
15 + -15 + 3x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 3x = 0 + -15
3x = 0 + -15

Combine like terms: 0 + -15 = -15
3x = -15

Divide each side by '3'.
x = -5

Simplifying
x = -5

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