5+5+5+x=18

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Solution for 5+5+5+x=18 equation: 


Simplifying
5 + 5 + 5 + x = 18

Combine like terms: 5 + 5 = 10
10 + 5 + x = 18

Combine like terms: 10 + 5 = 15
15 + x = 18

Solving
15 + x = 18

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + x = 18 + -15

Combine like terms: 15 + -15 = 0
0 + x = 18 + -15
x = 18 + -15

Combine like terms: 18 + -15 = 3
x = 3

Simplifying
x = 3

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