10a x (-3) (-6) = 10 + (-2) - (-7)
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10a×(-3)(-6) = 10 + (-2)-(-7)
10a × 18. = 10 + 7 - 2
10 a × 18 = 15
10a = 15/ 18
a = 15 / 18 × 10
a = 1/ 12
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