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-19=x+(3x-15)
We simplify the equation to the form, which is simple to understand
-19=x+(3x-15)
Remove unnecessary parentheses
-19=+x+3x-15
We move all terms containing x to the left and all other terms to the right.
-1x-3x=-15+19
We simplify left and right side of the equation.
-4x=+4
We divide both sides of the equation by -4 to get x.
x=-1
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