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-18 + 4x - y =-16
-18 + 4.0 -y =-16
-y = -16 +18
y= 2
pemislan y =0
-18 +4x -y =-16
-18 +4x-0 = -16
4x =-16+18
x=2:4 =1/2
5x+2y
5.1/2+2.2
5/2 +4
5/2 +8/2
=13/2