12+3(x-4)-21=

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Solution for 12+3(x-4)-21= equation:


Simplifying
12 + 3(x + -4) + -21 = 0

Reorder the terms:
12 + 3(-4 + x) + -21 = 0
12 + (-4 * 3 + x * 3) + -21 = 0
12 + (-12 + 3x) + -21 = 0

Reorder the terms:
12 + -12 + -21 + 3x = 0

Combine like terms: 12 + -12 = 0
0 + -21 + 3x = 0
-21 + 3x = 0

Solving
-21 + 3x = 0

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 3x = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 0 + 21
3x = 0 + 21

Combine like terms: 0 + 21 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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