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3(x2 -5x) -2(x2 -x) = 3x2 - 15x - 2x2 + 2x = 3x2 -2x2 -15x +2x = x2 -13x
p+q+r = 3a -5b +5+2b +4a -b = 3a +4a -5b +2b -b +5 = 7a -4b +5
2p-q+3r = 2(3a-5b) - (5+2b) +3(4a-b) = 6a -10b -5 -2b +12a -3b = 6a +12a -10b -2b -3b -5 = 18a - 15b -5