10 - x
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5 x 10-10 = 0.0000000005
(-6) x (-3) = 18 (-10) x (-9) = 90 18 - 90 = -72
(6 x 10-2) / (1 x 10-12) = 6 x 10(-2+12) = 6 x 1010
6 - x + 7 - 3x - 5 = -2x - 10 ∴ x + 3x - 2x = 6 + 7 - 5 + 10 ∴ 2x = 18 ∴ x = 9
x2-2x-10-5 = 0 x2-2x-15 = 0 (x+3)(x-5) = 0 x = -3 or x = 5