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5x+8x-9x=8+4
We simplify the equation to the form, which is simple to understand
5x+8x-9x=8+4
We move all terms containing x to the left and all other terms to the right.
+5x+8x-9x=+8+4
We simplify left and right side of the equation.
+4x=+12
We divide both sides of the equation by 4 to get x.
x=3
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