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-105-7x=63-15x
We simplify the equation to the form, which is simple to understand
-105-7x=63-15x
We move all terms containing x to the left and all other terms to the right.
-7x+15x=+63+105
We simplify left and right side of the equation.
+8x=+168
We divide both sides of the equation by 8 to get x.
x=21
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