3x+(x+5)=90

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Solution for 3x+(x+5)=90 equation:


Simplifying
3x + (x + 5) = 90

Reorder the terms:
3x + (5 + x) = 90

Remove parenthesis around (5 + x)
3x + 5 + x = 90

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

Combine like terms: 3x + x = 4x
5 + 4x = 90

Solving
5 + 4x = 90

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + 4x = 90 + -5

Combine like terms: 5 + -5 = 0
0 + 4x = 90 + -5
4x = 90 + -5

Combine like terms: 90 + -5 = 85
4x = 85

Divide each side by '4'.
x = 21.25

Simplifying
x = 21.25

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