15+3x=40-4

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Solution for 15+3x=40-4 equation: 


Simplifying
15 + 3x = 40 + -4

Combine like terms: 40 + -4 = 36
15 + 3x = 36

Solving
15 + 3x = 36

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 + 3x = 36 + -15

Combine like terms: 15 + -15 = 0
0 + 3x = 36 + -15
3x = 36 + -15

Combine like terms: 36 + -15 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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