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4x+9=90-7x
We simplify the equation to the form, which is simple to understand
4x+9=90-7x
We move all terms containing x to the left and all other terms to the right.
+4x+7x=+90-9
We simplify left and right side of the equation.
+11x=+81
We divide both sides of the equation by 11 to get x.
x=7.36363636364
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