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y=x+63-60
y=x+3
x*y+x=60
x(x+3)+x=60
x²+3x+x-60=0
x²+4x-60=0
Δ=b²-4ac
Δ=16+240 =256
√Δ=16
x1=(-b+√Δ)/(2a) =(-4+16)/2 =6
x2=(-b-√Δ)/(2a)=(-4-16)/2 =-10
x=6 y=6+3=9
x=-10 y=-10+3 =-7
6 i 9 lub -10 i -7 liczby