21+7x-18=8x-4

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Solution for 21+7x-18=8x-4 equation: 



21+7x-18=8x-4

We move all terms to the left:

21+7x-18-(8x-4)=0

We add all the numbers together, and all the variables

7x-(8x-4)+3=0

We get rid of parentheses

7x-8x+4+3=0

We add all the numbers together, and all the variables

-1x+7=0

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

-x=-7

x=-7/-1

x=+7

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