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300+2x=150+4x
We move all terms to the left:
300+2x-(150+4x)=0
We add all the numbers together, and all the variables
2x-(4x+150)+300=0
We get rid of parentheses
2x-4x-150+300=0
We add all the numbers together, and all the variables
-2x+150=0
We move all terms containing x to the left, all other terms to the right
-2x=-150
x=-150/-2
x=+75
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