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[3×(-5)] + [3×(-8)] = 3×(a+b) = 3×[(-5)+(-8)]
3x(a+b) = -15x + (-24x)
3x(a+b) = -39x
a + b = -39x/3x
a + b = -13
→ a = -13 - b
→ b = -13 - a