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8-4x-15=3-5x-21
We simplify the equation to the form, which is simple to understand
8-4x-15=3-5x-21
We move all terms containing x to the left and all other terms to the right.
-4x+5x=+3-21-8+15
We simplify left and right side of the equation.
+1x=-11
We divide both sides of the equation by 1 to get x.
x=-11
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