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-4+21=-7x-15
We simplify the equation to the form, which is simple to understand
-4+21=-7x-15
We move all terms containing x to the left and all other terms to the right.
+7x=-15+4-21
We simplify left and right side of the equation.
+7x=-32
We divide both sides of the equation by 07 to get x.
x=-4.57142857143
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