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-13=-3(x-3)+7(x-6)
We simplify the equation to the form, which is simple to understand
-13=-3(x-3)+7(x-6)
Reorder the terms in parentheses
-13=+(-3x+9)+7*(x-6)
Remove unnecessary parentheses
-13=-3x+9+7+*(+x-6+)
Reorder the terms in parentheses
-13=-3x+9+(+7x-42)
Remove unnecessary parentheses
-13=-3x+9+7x-42
We move all terms containing x to the left and all other terms to the right.
+3x-7x=+9-42+13
We simplify left and right side of the equation.
-4x=-20
We divide both sides of the equation by -4 to get x.
x=5
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