(6x-3)+(3x+15)=90

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Solution for (6x-3)+(3x+15)=90 equation:


Simplifying
(6x + -3) + (3x + 15) = 90

Reorder the terms:
(-3 + 6x) + (3x + 15) = 90

Remove parenthesis around (-3 + 6x)
-3 + 6x + (3x + 15) = 90

Reorder the terms:
-3 + 6x + (15 + 3x) = 90

Remove parenthesis around (15 + 3x)
-3 + 6x + 15 + 3x = 90

Reorder the terms:
-3 + 15 + 6x + 3x = 90

Combine like terms: -3 + 15 = 12
12 + 6x + 3x = 90

Combine like terms: 6x + 3x = 9x
12 + 9x = 90

Solving
12 + 9x = 90

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 9x = 90 + -12

Combine like terms: 12 + -12 = 0
0 + 9x = 90 + -12
9x = 90 + -12

Combine like terms: 90 + -12 = 78
9x = 78

Divide each side by '9'.
x = 8.666666667

Simplifying
x = 8.666666667

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