7x-15x+21=-9x+4

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Solution for 7x-15x+21=-9x+4 equation: 



7x-15x+21=-9x+4

We move all terms to the left:

7x-15x+21-(-9x+4)=0

We add all the numbers together, and all the variables

-8x-(-9x+4)+21=0

We get rid of parentheses

-8x+9x-4+21=0

We add all the numbers together, and all the variables

x+17=0

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

x=-17

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