12+3(2x-5)=21

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Solution for 12+3(2x-5)=21 equation:


Simplifying
12 + 3(2x + -5) = 21

Reorder the terms:
12 + 3(-5 + 2x) = 21
12 + (-5 * 3 + 2x * 3) = 21
12 + (-15 + 6x) = 21

Combine like terms: 12 + -15 = -3
-3 + 6x = 21

Solving
-3 + 6x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 6x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 6x = 21 + 3
6x = 21 + 3

Combine like terms: 21 + 3 = 24
6x = 24

Divide each side by '6'.
x = 4

Simplifying
x = 4

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