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5(4x+9)=205
We move all terms to the left:
5(4x+9)-(205)=0
We multiply parentheses
20x+45-205=0
We add all the numbers together, and all the variables
20x-160=0
We move all terms containing x to the left, all other terms to the right
20x=160
x=160/20
x=8
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