simplify using suitable minus 3 by 13 + 15 by 17 into bracket minus 3 by 15 + 7 by 15
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=> (-3) x 13 + 15 x 17 x (-3) x 15 + 7 x 15
=> (-39) + (-11,475) + 105
=> (-39) - 11,475 + 105
=> (-39) - 11,375
=> -11,409
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