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7x+4=8x-19
We move all terms to the left:
7x+4-(8x-19)=0
We get rid of parentheses
7x-8x+19+4=0
We add all the numbers together, and all the variables
-1x+23=0
We move all terms containing x to the left, all other terms to the right
-x=-23
x=-23/-1
x=+23
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