90=43-x-7

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Solution for 90=43-x-7 equation:


Simplifying
90 = 43 + -1x + -7

Reorder the terms:
90 = 43 + -7 + -1x

Combine like terms: 43 + -7 = 36
90 = 36 + -1x

Solving
90 = 36 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
90 + x = 36 + -1x + x

Combine like terms: -1x + x = 0
90 + x = 36 + 0
90 + x = 36

Add '-90' to each side of the equation.
90 + -90 + x = 36 + -90

Combine like terms: 90 + -90 = 0
0 + x = 36 + -90
x = 36 + -90

Combine like terms: 36 + -90 = -54
x = -54

Simplifying
x = -54

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