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30(2x+5)=900
We move all terms to the left:
30(2x+5)-(900)=0
We multiply parentheses
60x+150-900=0
We add all the numbers together, and all the variables
60x-750=0
We move all terms containing x to the left, all other terms to the right
60x=750
x=750/60
x=12+1/2
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