21(2-x)+12x=78

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Solution for 21(2-x)+12x=78 equation: 



21(2-x)+12x=78

We move all terms to the left:

21(2-x)+12x-(78)=0

We add all the numbers together, and all the variables

21(-1x+2)+12x-78=0

We add all the numbers together, and all the variables

12x+21(-1x+2)-78=0

We multiply parentheses

12x-21x+42-78=0

We add all the numbers together, and all the variables

-9x-36=0

We move all terms containing x to the left, all other terms to the right

-9x=36

x=36/-9

x=-4

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