3x+3(5x+7x)=12-x

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Solution for 3x+3(5x+7x)=12-x equation:


Simplifying
3x + 3(5x + 7x) = 12 + -1x

Combine like terms: 5x + 7x = 12x
3x + 3(12x) = 12 + -1x

Remove parenthesis around (12x)
3x + 3 * 12x = 12 + -1x

Multiply 3 * 12
3x + 36x = 12 + -1x

Combine like terms: 3x + 36x = 39x
39x = 12 + -1x

Solving
39x = 12 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
39x + x = 12 + -1x + x

Combine like terms: 39x + x = 40x
40x = 12 + -1x + x

Combine like terms: -1x + x = 0
40x = 12 + 0
40x = 12

Divide each side by '40'.
x = 0.3

Simplifying
x = 0.3

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