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(7-3x)/7=10
We move all terms to the left:
(7-3x)/7-(10)=0
We add all the numbers together, and all the variables
(-3x+7)/7-10=0
We multiply all the terms by the denominator
(-3x+7)-10*7=0
We add all the numbers together, and all the variables
(-3x+7)-70=0
We get rid of parentheses
-3x+7-70=0
We add all the numbers together, and all the variables
-3x-63=0
We move all terms containing x to the left, all other terms to the right
-3x=63
x=63/-3
x=-21
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