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40-3x=100-43x
We move all terms to the left:
40-3x-(100-43x)=0
We add all the numbers together, and all the variables
-3x-(-43x+100)+40=0
We get rid of parentheses
-3x+43x-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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