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1200+100x=900+150x
We move all terms to the left:
1200+100x-(900+150x)=0
We add all the numbers together, and all the variables
100x-(150x+900)+1200=0
We get rid of parentheses
100x-150x-900+1200=0
We add all the numbers together, and all the variables
-50x+300=0
We move all terms containing x to the left, all other terms to the right
-50x=-300
x=-300/-50
x=+6
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