12x-40=90x+15

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Solution for 12x-40=90x+15 equation:


Simplifying
12x + -40 = 90x + 15

Reorder the terms:
-40 + 12x = 90x + 15

Reorder the terms:
-40 + 12x = 15 + 90x

Solving
-40 + 12x = 15 + 90x

Solving for variable 'x'.

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

Add '-90x' to each side of the equation.
-40 + 12x + -90x = 15 + 90x + -90x

Combine like terms: 12x + -90x = -78x
-40 + -78x = 15 + 90x + -90x

Combine like terms: 90x + -90x = 0
-40 + -78x = 15 + 0
-40 + -78x = 15

Add '40' to each side of the equation.
-40 + 40 + -78x = 15 + 40

Combine like terms: -40 + 40 = 0
0 + -78x = 15 + 40
-78x = 15 + 40

Combine like terms: 15 + 40 = 55
-78x = 55

Divide each side by '-78'.
x = -0.7051282051

Simplifying
x = -0.7051282051

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