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7x-2x+19=8x-3+2x+21-4x
We move all terms to the left:
7x-2x+19-(8x-3+2x+21-4x)=0
We add all the numbers together, and all the variables
7x-2x-(6x+18)+19=0
We add all the numbers together, and all the variables
5x-(6x+18)+19=0
We get rid of parentheses
5x-6x-18+19=0
We add all the numbers together, and all the variables
-1x+1=0
We move all terms containing x to the left, all other terms to the right
-x=-1
x=-1/-1
x=1
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