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5x+8(2x-9)=42
We move all terms to the left:
5x+8(2x-9)-(42)=0
We multiply parentheses
5x+16x-72-42=0
We add all the numbers together, and all the variables
21x-114=0
We move all terms containing x to the left, all other terms to the right
21x=114
x=114/21
x=5+3/7
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