-3x+8x=20

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Solution for -3x+8x=20 equation: 


Simplifying
-3x + 8x = 20

Combine like terms: -3x + 8x = 5x
5x = 20

Solving
5x = 20

Solving for variable 'x'.

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

Divide each side by '5'.
x = 4

Simplifying
x = 4

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