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a = 4 - 6
a = -2
-5 = 4 - 3b
3b = 4+ 5
3b = 9
b= 3
2b - 5a = 2x3 - 5x(-2)
=6 - (-10)
=6+10
=16
a=-2 -3b=-5-4
b=-9:-3
b=3
2b-5a=2(3)-5(2)=6-(-10)=16