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20(2x+3)=100
We move all terms to the left:
20(2x+3)-(100)=0
We multiply parentheses
40x+60-100=0
We add all the numbers together, and all the variables
40x-40=0
We move all terms containing x to the left, all other terms to the right
40x=40
x=40/40
x=1
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