4+5X+7X=40

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Solution for 4+5X+7X=40 equation: 


Simplifying
4 + 5X + 7X = 40

Combine like terms: 5X + 7X = 12X
4 + 12X = 40

Solving
4 + 12X = 40

Solving for variable 'X'.

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

Add '-4' to each side of the equation.
4 + -4 + 12X = 40 + -4

Combine like terms: 4 + -4 = 0
0 + 12X = 40 + -4
12X = 40 + -4

Combine like terms: 40 + -4 = 36
12X = 36

Divide each side by '12'.
X = 3

Simplifying
X = 3

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