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A2 = -12
A2-A1= R
-12 - (-6) = -6
a3 = a2+r
a3 = -12-6 = -18
Jeśli tam jest 18-2x
-18=18-2x
-36=-2x
x=18
jeśli tam jest 18-x^2
-18=18-x^2
-36=-x^2
x^2=36
x=6 lub x=-6