4x+12+3x-3=90

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


Simplifying
4x + 12 + 3x + -3 = 90

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

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

Combine like terms: 4x + 3x = 7x
9 + 7x = 90

Solving
9 + 7x = 90

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 + 7x = 90 + -9

Combine like terms: 9 + -9 = 0
0 + 7x = 90 + -9
7x = 90 + -9

Combine like terms: 90 + -9 = 81
7x = 81

Divide each side by '7'.
x = 11.57142857

Simplifying
x = 11.57142857

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