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-105=6x+3(4x-5)
We simplify the equation to the form, which is simple to understand
-105=6x+3(4x-5)
Reorder the terms in parentheses
-105=6x+(+12x-15)
Remove unnecessary parentheses
-105=+6x+12x-15
We move all terms containing x to the left and all other terms to the right.
-6x-12x=-15+105
We simplify left and right side of the equation.
-18x=+90
We divide both sides of the equation by -18 to get x.
x=-5
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