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17x+20y=210
x= 15-y
17(15-y) + 20y= 210
255 - 17y +20y = 210
3y= - 45 |:3
y= -15
x= 15-y
x= 15 - (-15)
x=30
17x+20y=210
x=15-y
17*(15-y)+20y=210
x=15-y
255-17y+20y=210/-255
x=15-y
3y=-45/:3
x=15-y
y=-15
x=15-(-15)
y=-15
x=15+15
y=-15
x=30
y=-15
17x+20y=210
x=15-y
17(15-y) + 20y=210
x=15-y
255-17y + 20y = 210
x=15-y
3y=-45/:3
x=15-y
y=-15
x=15-(-15)
y=-15
x=30
y=-15