42+3x=87

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Solution for 42+3x=87 equation: 


Simplifying
42 + 3x = 87

Solving
42 + 3x = 87

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + 3x = 87 + -42

Combine like terms: 42 + -42 = 0
0 + 3x = 87 + -42
3x = 87 + -42

Combine like terms: 87 + -42 = 45
3x = 45

Divide each side by '3'.
x = 15

Simplifying
x = 15

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