reduire chaque expression
a) 7x+3+5x+6 b) -4y+9-5y-7
c) 8a-9-12a+3 d) 15b²+3b-9b²-5
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b) -9y+2
c) -4a-6
d)6b²+3b-5
b) -4y+9-5y-7 = 2 - 9y
c) 8a-9-12a+3 = -4a - 6 = - 2 (2a +3)
d) 15b²+3b-9b²-5 = 6 b^2 + 3 b -5 = 3 b (2b+1) - 5