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15x-7x+13=4x-(26-7x)
We simplify the equation to the form, which is simple to understand
15x-7x+13=4x-(26-7x)
Remove unnecessary parentheses
15x-7x+13=4x-26+7x
We move all terms containing x to the left and all other terms to the right.
+15x-7x-4x-7x=-26-13
We simplify left and right side of the equation.
-3x=-39
We divide both sides of the equation by -3 to get x.
x=13
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