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7(5-5x)=210
We move all terms to the left:
7(5-5x)-(210)=0
We add all the numbers together, and all the variables
7(-5x+5)-210=0
We multiply parentheses
-35x+35-210=0
We add all the numbers together, and all the variables
-35x-175=0
We move all terms containing x to the left, all other terms to the right
-35x=175
x=175/-35
x=-5
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