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3200=1200+2.15x
We move all terms to the left:
3200-(1200+2.15x)=0
We add all the numbers together, and all the variables
-(2.15x+1200)+3200=0
We get rid of parentheses
-2.15x-1200+3200=0
We add all the numbers together, and all the variables
-2.15x+2000=0
We move all terms containing x to the left, all other terms to the right
-2.15x=-2000
x=-2000/-2.15
x=930+0.5/2.15
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