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13=7x+4-10x
We simplify the equation to the form, which is simple to understand
13=7x+4-10x
We move all terms containing x to the left and all other terms to the right.
-7x+10x=+4-13
We simplify left and right side of the equation.
+3x=-9
We divide both sides of the equation by 3 to get x.
x=-3
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