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10x+20(x+3)=150
We move all terms to the left:
10x+20(x+3)-(150)=0
We multiply parentheses
10x+20x+60-150=0
We add all the numbers together, and all the variables
30x-90=0
We move all terms containing x to the left, all other terms to the right
30x=90
x=90/30
x=3
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