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150=45+x+2x+3x
We move all terms to the left:
150-(45+x+2x+3x)=0
We add all the numbers together, and all the variables
-(6x+45)+150=0
We get rid of parentheses
-6x-45+150=0
We add all the numbers together, and all the variables
-6x+105=0
We move all terms containing x to the left, all other terms to the right
-6x=-105
x=-105/-6
x=17+1/2
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