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3y-15+4y+2y-9=180
9y=180+15+9
9y=204
y=204/9
y=68/3
y=22 2/3
3y+4y+2y-15-9=180
8y-24=180
8y=180+24
8y=204
y=204 : 8
y=25 4/8
y=25 1/2 atau 25,5