20+3x+x=90

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Solution for 20+3x+x=90 equation: 


Simplifying
20 + 3x + x = 90

Combine like terms: 3x + x = 4x
20 + 4x = 90

Solving
20 + 4x = 90

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + 4x = 90 + -20

Combine like terms: 20 + -20 = 0
0 + 4x = 90 + -20
4x = 90 + -20

Combine like terms: 90 + -20 = 70
4x = 70

Divide each side by '4'.
x = 17.5

Simplifying
x = 17.5

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