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30+9*x=66
We simplify the equation to the form, which is simple to understand
30+9*x=66
We move all terms containing x to the left and all other terms to the right.
+9x=+66-30
We simplify left and right side of the equation.
+9x=+36
We divide both sides of the equation by 9 to get x.
x=4
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