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9+11+x=30
We simplify the equation to the form, which is simple to understand
9+11+x=30
We move all terms containing x to the left and all other terms to the right.
+1x=+30-9-11
We simplify left and right side of the equation.
+1x=+10
We divide both sides of the equation by 1 to get x.
x=10