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13=-3x+x-9
We simplify the equation to the form, which is simple to understand
13=-3x+x-9
We move all terms containing x to the left and all other terms to the right.
+3x-1x=-9-13
We simplify left and right side of the equation.
+2x=-22
We divide both sides of the equation by 2 to get x.
x=-11
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