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a₁₀=a₁+9r
a₁₀=a₁+9*5
a₁₀=a₁+45
za wzoru na S₁₀=(a₁+a₁₀):2)*10
95=(a₁+a₁+45):2)*10
95=(2a₁+45)*5
95=10a₁+225
10a₁=95-225
10a₁=-130 /:10
a₁=-13