21+15x+7=-x+12

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


Simplifying
21 + 15x + 7 = -1x + 12

Reorder the terms:
21 + 7 + 15x = -1x + 12

Combine like terms: 21 + 7 = 28
28 + 15x = -1x + 12

Reorder the terms:
28 + 15x = 12 + -1x

Solving
28 + 15x = 12 + -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.
28 + 15x + x = 12 + -1x + x

Combine like terms: 15x + x = 16x
28 + 16x = 12 + -1x + x

Combine like terms: -1x + x = 0
28 + 16x = 12 + 0
28 + 16x = 12

Add '-28' to each side of the equation.
28 + -28 + 16x = 12 + -28

Combine like terms: 28 + -28 = 0
0 + 16x = 12 + -28
16x = 12 + -28

Combine like terms: 12 + -28 = -16
16x = -16

Divide each side by '16'.
x = -1

Simplifying
x = -1

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