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2(100x+60x)=450
We move all terms to the left:
2(100x+60x)-(450)=0
We add all the numbers together, and all the variables
2(+160x)-450=0
We multiply parentheses
320x-450=0
We move all terms containing x to the left, all other terms to the right
320x=450
x=450/320
x=1+13/32
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