(3x+12)+(9x-4)=90

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Solution for (3x+12)+(9x-4)=90 equation:


Simplifying
(3x + 12) + (9x + -4) = 90

Reorder the terms:
(12 + 3x) + (9x + -4) = 90

Remove parenthesis around (12 + 3x)
12 + 3x + (9x + -4) = 90

Reorder the terms:
12 + 3x + (-4 + 9x) = 90

Remove parenthesis around (-4 + 9x)
12 + 3x + -4 + 9x = 90

Reorder the terms:
12 + -4 + 3x + 9x = 90

Combine like terms: 12 + -4 = 8
8 + 3x + 9x = 90

Combine like terms: 3x + 9x = 12x
8 + 12x = 90

Solving
8 + 12x = 90

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + 12x = 90 + -8

Combine like terms: 8 + -8 = 0
0 + 12x = 90 + -8
12x = 90 + -8

Combine like terms: 90 + -8 = 82
12x = 82

Divide each side by '12'.
x = 6.833333333

Simplifying
x = 6.833333333

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