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a1=x
r=-50
a12=x-11*50
S12=(x+x-550)/2* 12
8700=(x-275)*12
8700=12x-3300
12x=12000
x=1000 zł
a1=1000zł
a12=1000 - 550=450
pierwsza rata 1000zł, ostatnia(12) 450zł