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150(30-x)=420
We move all terms to the left:
150(30-x)-(420)=0
We add all the numbers together, and all the variables
150(-1x+30)-420=0
We multiply parentheses
-150x+4500-420=0
We add all the numbers together, and all the variables
-150x+4080=0
We move all terms containing x to the left, all other terms to the right
-150x=-4080
x=-4080/-150
x=27+1/5
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