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40x+4=2x+100
We move all terms to the left:
40x+4-(2x+100)=0
We get rid of parentheses
40x-2x-100+4=0
We add all the numbers together, and all the variables
38x-96=0
We move all terms containing x to the left, all other terms to the right
38x=96
x=96/38
x=2+10/19
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