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8x+40=4x+8
We move all terms to the left:
8x+40-(4x+8)=0
We get rid of parentheses
8x-4x-8+40=0
We add all the numbers together, and all the variables
4x+32=0
We move all terms containing x to the left, all other terms to the right
4x=-32
x=-32/4
x=-8
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