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x - y = -2 +
3x = 9
x = 3
x-y = -2
3-y = -2
y = 5
2a+b = 2(3)+5
= 6+5
= 11
y=11-2x
x-y=-2
y=x+2
11-2x=x+2
9=3x
x=3
y=3+2
y=5
maka
2a+b
=2.3+5
=11