7 + 13x = -9 ie 13x = -9 - 7 x = -16/13 or "Minus one and three thirteenths"
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(3x - 7)(2x + 9) = 0 x = 7/3 or -9/2
x2-13x+36=(x-9)(x-4)=0 x=9 or x=4
Y+7=9 equals 2+7=9.
The answer is 144. The compound operator for (a) and (b) in each pair is a * (a+b). For 9 and 7, this is 9 x (9+7) = 9 x 16 = 144.
144 9+7 = 16 and 9*16 = 144