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105=-7(7x-1)
We move all terms to the left:
105-(-7(7x-1))=0
We calculate terms in parentheses: -(-7(7x-1)), so:We get rid of parentheses
-7(7x-1)
We multiply parentheses
-49x+7
Back to the equation:
-(-49x+7)
49x-7+105=0
We add all the numbers together, and all the variables
49x+98=0
We move all terms containing x to the left, all other terms to the right
49x=-98
x=-98/49
x=-2
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