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400=225+15x
We move all terms to the left:
400-(225+15x)=0
We add all the numbers together, and all the variables
-(15x+225)+400=0
We get rid of parentheses
-15x-225+400=0
We add all the numbers together, and all the variables
-15x+175=0
We move all terms containing x to the left, all other terms to the right
-15x=-175
x=-175/-15
x=11+2/3
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