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1200x+90=1800x+120
We move all terms to the left:
1200x+90-(1800x+120)=0
We get rid of parentheses
1200x-1800x-120+90=0
We add all the numbers together, and all the variables
-600x-30=0
We move all terms containing x to the left, all other terms to the right
-600x=30
x=30/-600
x=-1/20
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