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3(x-30)=5x-21
We move all terms to the left:
3(x-30)-(5x-21)=0
We multiply parentheses
3x-(5x-21)-90=0
We get rid of parentheses
3x-5x+21-90=0
We add all the numbers together, and all the variables
-2x-69=0
We move all terms containing x to the left, all other terms to the right
-2x=69
x=69/-2
x=-34+1/2
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