-10x+90=-21x+12

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Solution for -10x+90=-21x+12 equation: 



-10x+90=-21x+12

We move all terms to the left:

-10x+90-(-21x+12)=0

We get rid of parentheses

-10x+21x-12+90=0

We add all the numbers together, and all the variables

11x+78=0

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

11x=-78

x=-78/11

x=-7+1/11

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