8x+5-3x+8=90

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Solution for 8x+5-3x+8=90 equation: 


Simplifying
8x + 5 + -3x + 8 = 90

Reorder the terms:
5 + 8 + 8x + -3x = 90

Combine like terms: 5 + 8 = 13
13 + 8x + -3x = 90

Combine like terms: 8x + -3x = 5x
13 + 5x = 90

Solving
13 + 5x = 90

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + 5x = 90 + -13

Combine like terms: 13 + -13 = 0
0 + 5x = 90 + -13
5x = 90 + -13

Combine like terms: 90 + -13 = 77
5x = 77

Divide each side by '5'.
x = 15.4

Simplifying
x = 15.4

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