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x + y = 29
x + 2y = 41
y = 12
x= 29 - 12 = 17
2x+3y=70
-2x-2y=-58
2x+3y=70
y=12
x+12=29
x=29-12
x=17
x=17
y=12
2x+3y=70
x=29-y
2(29-y)+3y=70
58-2y+3y=70
y=70-58
y=12
x=29-12
x=17