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For all you algebra illiterate:
2x + y - 60 = x + 2y - 75
2x + y + 15 = x + 2y
2x/y + 1 + 15/y = x/y + 2
2x/y + 15/y = x/y + 1
2 + 15/x = 1 + y/x
1 + 15/x = y/x
x + 15 = y
x = y - 15
2(y - 15) + y = 60
2y - 30 + y = 60
3y = 90
y = 30
x + 2(x + 15) = 75
x + 2x - 30 = 75
3x = 45
x = 15
For all you algebra illiterate:
2x + y - 60 = x + 2y - 75
2x + y + 15 = x + 2y
2x/y + 1 + 15/y = x/y + 2
2x/y + 15/y = x/y + 1
2 + 15/x = 1 + y/x
1 + 15/x = y/x
x + 15 = y
x = y - 15
2(y - 15) + y = 60
2y - 30 + y = 60
3y = 90
y = 30
x + 2(x + 15) = 75
x + 2x - 30 = 75
3x = 45
x = 15