3*X+(X+20)=90

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Solution for 3*X+(X+20)=90 equation:


Simplifying
3X + (X + 20) = 90

Reorder the terms:
3X + (20 + X) = 90

Remove parenthesis around (20 + X)
3X + 20 + X = 90

Reorder the terms:
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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