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5m - (-5)(4) = 4 × ((2)(-1) - (1)(3))
5m + 20 = 4 × (-2-3)
5m + 20 = 4 × (-5)
5m + 20 = -20
5m = -20 -20
5m = -40
m = -40/5
m = -8
5m + 20 = 4 (-2 - 3)
5m + 20 = -20
5m = - 40
m = - 8 ← jwb