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21.3+1x=30.
We simplify the equation to the form, which is simple to understand
21.3+1x=30.
We move all terms containing x to the left and all other terms to the right.
+1x=+30-21.3
We simplify left and right side of the equation.
+1x=+8.7
We divide both sides of the equation by 1 to get x.
x=8.7
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