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150=x+x+4x+4x
We move all terms to the left:
150-(x+x+4x+4x)=0
We add all the numbers together, and all the variables
-(+10x)+150=0
We get rid of parentheses
-10x+150=0
We move all terms containing x to the left, all other terms to the right
-10x=-150
x=-150/-10
x=+15
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