x+y=15012x+6y=1260
x+y=150
12x+6y=1260
x=150-y
12(150-y)+6y=1260
1800-12y+6y=1260
-6y=1260-1800
-6y=-540/:(-6)
y=90
x=150-90
x=60
x+y=150/*-6
-6x-6y=-900
6x+0=360/6
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x+y=150
12x+6y=1260
x=150-y
12(150-y)+6y=1260
x=150-y
1800-12y+6y=1260
x=150-y
-6y=1260-1800
x=150-y
-6y=-540/:(-6)
x=150-y
y=90
x=150-90
y=90
x=60
y=90
x+y=150/*-6
12x+6y=1260
-6x-6y=-900
12x+6y=1260
6x+0=360/6
x=60