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42x+4=9x-8x
We move all terms to the left:
42x+4-(9x-8x)=0
We add all the numbers together, and all the variables
42x-(+x)+4=0
We get rid of parentheses
42x-x+4=0
We add all the numbers together, and all the variables
41x+4=0
We move all terms containing x to the left, all other terms to the right
41x=-4
x=-4/41
x=-4/41
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