21-3=2(x-1)

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Solution for 21-3=2(x-1) equation:


Simplifying
21 + -3 = 2(x + -1)

Combine like terms: 21 + -3 = 18
18 = 2(x + -1)

Reorder the terms:
18 = 2(-1 + x)
18 = (-1 * 2 + x * 2)
18 = (-2 + 2x)

Solving
18 = -2 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
18 + -2x = -2 + 2x + -2x

Combine like terms: 2x + -2x = 0
18 + -2x = -2 + 0
18 + -2x = -2

Add '-18' to each side of the equation.
18 + -18 + -2x = -2 + -18

Combine like terms: 18 + -18 = 0
0 + -2x = -2 + -18
-2x = -2 + -18

Combine like terms: -2 + -18 = -20
-2x = -20

Divide each side by '-2'.
x = 10

Simplifying
x = 10

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