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In these types of questions, you have to try to isolate the unknown variable.
14 = 2 + r - 21.
Remember whenever you move ANYTHING over the equals sign, you have to make its sign opposite. Since the r is positive, and we are moving it over the equals sign we have to make it a negative sign. When we move the 14 over, it is currently positive so we make it into a negative.
-r = -14 + 2 - 21
-r = -12 - 21
-r = -43
(Eliminate the negative sign)
r = 43.
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