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19=-7+4x+21-8x
We move all terms to the left:
19-(-7+4x+21-8x)=0
We add all the numbers together, and all the variables
-(-4x+14)+19=0
We get rid of parentheses
4x-14+19=0
We add all the numbers together, and all the variables
4x+5=0
We move all terms containing x to the left, all other terms to the right
4x=-5
x=-5/4
x=-1+1/4
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