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1.2x=9
x=9:2
x=4,5
2. 3z=9
z=9:3
z=3
3.2x-y+3z=9
(2×4,5)-y+(3×3)=9
4y+9=9
4y=9:9
4y=1
y=4:1
y=4
maaf klo salah