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-21+4x=59+-4x
We move all terms to the left:
-21+4x-(59+-4x)=0
We add all the numbers together, and all the variables
4x-(-4x)-21=0
We get rid of parentheses
4x+4x-21=0
We add all the numbers together, and all the variables
8x-21=0
We move all terms containing x to the left, all other terms to the right
8x=21
x=21/8
x=2+5/8
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