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5x+8(2x+9)=54
We move all terms to the left:
5x+8(2x+9)-(54)=0
We multiply parentheses
5x+16x+72-54=0
We add all the numbers together, and all the variables
21x+18=0
We move all terms containing x to the left, all other terms to the right
21x=-18
x=-18/21
x=-6/7
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