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3x+21.6=79.2
We simplify the equation to the form, which is simple to understand
3x+21.6=79.2
We move all terms containing x to the left and all other terms to the right.
+3x=+79.2-21.6
We simplify left and right side of the equation.
+3x=+57.6
We divide both sides of the equation by 3 to get x.
x=19.2
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