40+15+x=75

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Solution for 40+15+x=75 equation: 


Simplifying
40 + 15 + x = 75

Combine like terms: 40 + 15 = 55
55 + x = 75

Solving
55 + x = 75

Solving for variable 'x'.

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

Add '-55' to each side of the equation.
55 + -55 + x = 75 + -55

Combine like terms: 55 + -55 = 0
0 + x = 75 + -55
x = 75 + -55

Combine like terms: 75 + -55 = 20
x = 20

Simplifying
x = 20

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