m/14 = 3/21
m/14 = 1/7
m/14 = 2/14
m = 2
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A + 9 = 21 A = 21 - 9 A = 12
21
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.
x/11 + 21 = 7 x/11 = -14 x = -154
x/11 + 21 = 7 x/11 = -14 x = -154