9 x 9 = 81
Do: 10 x 9 = 90, then take 9 away.
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what is the answer to -9x-3y=-9
Integral : 9x + 8 = 9(x squared)/2 + 8x Differential : 9x +8 = 9
2x2 - 9x = 18 2x2 - 9x -18 = 0 (2x - 18)(x + 9) x= -9 and 9
x2-9x = x(x-9)
8x - 9 = 9x - 5 8x - 8x - 9 = 9x - 8x - 5 -9 = x - 5 -9 + 5 = x - 5 + 5 -4 = x