x+3x+12(3x)=600

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Solution for x+3x+12(3x)=600 equation: 


Simplifying
x + 3x + 12(3x) = 600

Remove parenthesis around (3x)
x + 3x + 12 * 3x = 600

Multiply 12 * 3
x + 3x + 36x = 600

Combine like terms: x + 3x = 4x
4x + 36x = 600

Combine like terms: 4x + 36x = 40x
40x = 600

Solving
40x = 600

Solving for variable 'x'.

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

Divide each side by '40'.
x = 15

Simplifying
x = 15

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