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21+2.2x=15.4+3.6x
We simplify the equation to the form, which is simple to understand
21+2.2x=15.4+3.6x
We move all terms containing x to the left and all other terms to the right.
+2.2x-3.6x=+15.4-21
We simplify left and right side of the equation.
-1.4x=-5.6
We divide both sides of the equation by -1.4 to get x.
x=4
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