21x=3x-120

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Solution for 21x=3x-120 equation: 



21x=3x-120

We move all terms to the left:

21x-(3x-120)=0

We get rid of parentheses

21x-3x+120=0

We add all the numbers together, and all the variables

18x+120=0

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

18x=-120

x=-120/18

x=-6+2/3

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