15-(x-1)=12

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Solution for 15-(x-1)=12 equation:


Simplifying
15 + -1(x + -1) = 12

Reorder the terms:
15 + -1(-1 + x) = 12
15 + (-1 * -1 + x * -1) = 12
15 + (1 + -1x) = 12

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

Solving
16 + -1x = 12

Solving for variable 'x'.

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

Add '-16' to each side of the equation.
16 + -16 + -1x = 12 + -16

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

Combine like terms: 12 + -16 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4

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