1.2x + 2.2 = 3.7
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Solving problems with decimals is no different if the numbers were whole numbers. The goal is to solve for x by itself.
Step 1: Is to get the x on one side of the equal sign, and the numbers with the decimals on the other.
In this case, let's keep the x on the left side, and move the decimals to the right side.
In order to get rid of the 2.2 on the left side, we must subtract 2.2 to both sides (what you do to one side, you must do to the other)
Now, we want to get x by itself. It is currently multiplied by 1.2. We do the opposite, and divide by 1.2 (to both sides)
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