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(-4-3)-(-5-2a) = -4-3+5+2a
= 2a-2
= a-1
b.
(-a)(5a+3b+15) = -5a²-3ab-15a
-7+5-2a
-2-2a=0
-2a=2+0
a=2/2
a=1
maaf kalo salah