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150=4x+2x
We move all terms to the left:
150-(4x+2x)=0
We add all the numbers together, and all the variables
-(+6x)+150=0
We get rid of parentheses
-6x+150=0
We move all terms containing x to the left, all other terms to the right
-6x=-150
x=-150/-6
x=+25
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