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3.4x+2.90(20-x)=60
We move all terms to the left:
3.4x+2.90(20-x)-(60)=0
We add all the numbers together, and all the variables
3.4x+2.90(-1x+20)-60=0
We multiply parentheses
3.4x-2.9x+58-60=0
We add all the numbers together, and all the variables
0.5x-2=0
We move all terms containing x to the left, all other terms to the right
0.5x=2
x=2/0.5
x=4
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