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40-2x=100-42x
We move all terms to the left:
40-2x-(100-42x)=0
We add all the numbers together, and all the variables
-2x-(-42x+100)+40=0
We get rid of parentheses
-2x+42x-100+40=0
We add all the numbers together, and all the variables
40x-60=0
We move all terms containing x to the left, all other terms to the right
40x=60
x=60/40
x=1+1/2
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