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x + 3y = 15
x + 3( x + 5 ) = 15
x + 3x + 15 = 15
4x = 0
x = 0
y = x + 5
y = 0 + 5
y = 5
HP = { x,y }
HP = { 0,5 }
x - y = 0 - 5 = - 5