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39=-3(21-x)+3(x-4)
We simplify the equation to the form, which is simple to understand
39=-3(21-x)+3(x-4)
Reorder the terms in parentheses
39=+(-63+3x)+3*(x-4)
Remove unnecessary parentheses
+39=-63+3x+3+*(+x-4+)
Reorder the terms in parentheses
39=-63+3x+(+3x-12)
Remove unnecessary parentheses
+39=-63+3x+3x-12
We move all terms containing x to the left and all other terms to the right.
-3x-3x=-63-12-39
We simplify left and right side of the equation.
-6x=-114
We divide both sides of the equation by -6 to get x.
x=19
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