21-7x=3(2-2x)

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Solution for 21-7x=3(2-2x) equation:


Simplifying
21 + -7x = 3(2 + -2x)
21 + -7x = (2 * 3 + -2x * 3)
21 + -7x = (6 + -6x)

Solving
21 + -7x = 6 + -6x

Solving for variable 'x'.

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

Add '6x' to each side of the equation.
21 + -7x + 6x = 6 + -6x + 6x

Combine like terms: -7x + 6x = -1x
21 + -1x = 6 + -6x + 6x

Combine like terms: -6x + 6x = 0
21 + -1x = 6 + 0
21 + -1x = 6

Add '-21' to each side of the equation.
21 + -21 + -1x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = 6 + -21
-1x = 6 + -21

Combine like terms: 6 + -21 = -15
-1x = -15

Divide each side by '-1'.
x = 15

Simplifying
x = 15

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