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8x+9x-84=63-4x
We simplify the equation to the form, which is simple to understand
8x+9x-84=63-4x
We move all terms containing x to the left and all other terms to the right.
+8x+9x+4x=+63+84
We simplify left and right side of the equation.
+21x=+147
We divide both sides of the equation by 21 to get x.
x=7
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