12+3(2x-7)=21

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Solution for 12+3(2x-7)=21 equation:


Simplifying
12 + 3(2x + -7) = 21

Reorder the terms:
12 + 3(-7 + 2x) = 21
12 + (-7 * 3 + 2x * 3) = 21
12 + (-21 + 6x) = 21

Combine like terms: 12 + -21 = -9
-9 + 6x = 21

Solving
-9 + 6x = 21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 6x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 6x = 21 + 9
6x = 21 + 9

Combine like terms: 21 + 9 = 30
6x = 30

Divide each side by '6'.
x = 5

Simplifying
x = 5

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