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3(5x-7x)+100=125
We move all terms to the left:
3(5x-7x)+100-(125)=0
We add all the numbers together, and all the variables
3(-2x)+100-125=0
We add all the numbers together, and all the variables
3(-2x)-25=0
We multiply parentheses
-6x-25=0
We move all terms containing x to the left, all other terms to the right
-6x=25
x=25/-6
x=-4+1/6
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