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6x-210=-14x+90
We move all terms to the left:
6x-210-(-14x+90)=0
We get rid of parentheses
6x+14x-90-210=0
We add all the numbers together, and all the variables
20x-300=0
We move all terms containing x to the left, all other terms to the right
20x=300
x=300/20
x=15
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