3x+12+x-2=21

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


Simplifying
3x + 12 + x + -2 = 21

Reorder the terms:
12 + -2 + 3x + x = 21

Combine like terms: 12 + -2 = 10
10 + 3x + x = 21

Combine like terms: 3x + x = 4x
10 + 4x = 21

Solving
10 + 4x = 21

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + 4x = 21 + -10

Combine like terms: 10 + -10 = 0
0 + 4x = 21 + -10
4x = 21 + -10

Combine like terms: 21 + -10 = 11
4x = 11

Divide each side by '4'.
x = 2.75

Simplifying
x = 2.75

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