90-a=3x-40

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Solution for 90-a=3x-40 equation:


Simplifying
90 + -1a = 3x + -40

Reorder the terms:
90 + -1a = -40 + 3x

Solving
90 + -1a = -40 + 3x

Solving for variable 'a'.

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

Add '-90' to each side of the equation.
90 + -90 + -1a = -40 + -90 + 3x

Combine like terms: 90 + -90 = 0
0 + -1a = -40 + -90 + 3x
-1a = -40 + -90 + 3x

Combine like terms: -40 + -90 = -130
-1a = -130 + 3x

Divide each side by '-1'.
a = 130 + -3x

Simplifying
a = 130 + -3x

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