15x+21=3x-4

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Solution for 15x+21=3x-4 equation: 



15x+21=3x-4

We move all terms to the left:

15x+21-(3x-4)=0

We get rid of parentheses

15x-3x+4+21=0

We add all the numbers together, and all the variables

12x+25=0

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

12x=-25

x=-25/12

x=-2+1/12

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