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2(x+30)=75
We move all terms to the left:
2(x+30)-(75)=0
We multiply parentheses
2x+60-75=0
We add all the numbers together, and all the variables
2x-15=0
We move all terms containing x to the left, all other terms to the right
2x=15
x=15/2
x=7+1/2
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