90+3x+20+4x-21=18-

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Solution for 90+3x+20+4x-21=18- equation: 



90+3x+20+4x-21=18-

We move all terms to the left:

90+3x+20+4x-21-(18-)=0

We add all the numbers together, and all the variables

3x+4x+90+20-21-0=0

We add all the numbers together, and all the variables

7x+89=0

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

7x=-89

x=-89/7

x=-12+5/7

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