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210-5x=4x-15
We move all terms to the left:
210-5x-(4x-15)=0
We get rid of parentheses
-5x-4x+15+210=0
We add all the numbers together, and all the variables
-9x+225=0
We move all terms containing x to the left, all other terms to the right
-9x=-225
x=-225/-9
x=+25
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