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10x+20(15-x)=230
We move all terms to the left:
10x+20(15-x)-(230)=0
We add all the numbers together, and all the variables
10x+20(-1x+15)-230=0
We multiply parentheses
10x-20x+300-230=0
We add all the numbers together, and all the variables
-10x+70=0
We move all terms containing x to the left, all other terms to the right
-10x=-70
x=-70/-10
x=+7
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