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8(9x+21)=528
We move all terms to the left:
8(9x+21)-(528)=0
We multiply parentheses
72x+168-528=0
We add all the numbers together, and all the variables
72x-360=0
We move all terms containing x to the left, all other terms to the right
72x=360
x=360/72
x=5
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