3x+13+5x-7=90

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Solution for 3x+13+5x-7=90 equation:


Simplifying
3x + 13 + 5x + -7 = 90

Reorder the terms:
13 + -7 + 3x + 5x = 90

Combine like terms: 13 + -7 = 6
6 + 3x + 5x = 90

Combine like terms: 3x + 5x = 8x
6 + 8x = 90

Solving
6 + 8x = 90

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 8x = 90 + -6

Combine like terms: 6 + -6 = 0
0 + 8x = 90 + -6
8x = 90 + -6

Combine like terms: 90 + -6 = 84
8x = 84

Divide each side by '8'.
x = 10.5

Simplifying
x = 10.5

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