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1400-25x=1200+15x
We move all terms to the left:
1400-25x-(1200+15x)=0
We add all the numbers together, and all the variables
-25x-(15x+1200)+1400=0
We get rid of parentheses
-25x-15x-1200+1400=0
We add all the numbers together, and all the variables
-40x+200=0
We move all terms containing x to the left, all other terms to the right
-40x=-200
x=-200/-40
x=+5
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