20x-21x+7=12-15

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Solution for 20x-21x+7=12-15 equation:


Simplifying
20x + -21x + 7 = 12 + -15

Reorder the terms:
7 + 20x + -21x = 12 + -15

Combine like terms: 20x + -21x = -1x
7 + -1x = 12 + -15

Combine like terms: 12 + -15 = -3
7 + -1x = -3

Solving
7 + -1x = -3

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + -1x = -3 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = -3 + -7
-1x = -3 + -7

Combine like terms: -3 + -7 = -10
-1x = -10

Divide each side by '-1'.
x = 10

Simplifying
x = 10

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