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y= 3
=> 4x= --32
=> 3y= 9
5x+7y=-19
15x+25y=-45
15x+21y=-57 -
4y=12
y=3
3x+5y=-9
3x+5(3)=-9
3x+15=-9
3x=-9-15
3x=-24
x=-8
NIlai 4x= 4(-8)=-32
nilai 3y= 3(3)=9