4x+3+x-12=21

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


Simplifying
4x + 3 + x + -12 = 21

Reorder the terms:
3 + -12 + 4x + x = 21

Combine like terms: 3 + -12 = -9
-9 + 4x + x = 21

Combine like terms: 4x + x = 5x
-9 + 5x = 21

Solving
-9 + 5x = 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 + 5x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 5x = 21 + 9
5x = 21 + 9

Combine like terms: 21 + 9 = 30
5x = 30

Divide each side by '5'.
x = 6

Simplifying
x = 6

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