Negative 7
-7
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4x + 2 = 3x + 9 x + 2 = 9 x = 7
X equals 2 :)
x = -2
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.
x^2 +9 =x^2 -9 9=-9 No solution