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2014-03-19T22:51:42+02:00
x+y=142;=>y=142-x
 y+z=90=>z=90-y
x+z=156
x+90-y=156
x+90-142+x=156
2x-52=156
2x=208
x=104
y=142-104
y=38
z=90-38
z=52
2 3 2