a₁₀ + a₁₈ = 62
a₅ + a₁₂ = 40
a₁ + 9r + a₁ + 17r = 62
a₁ + 4r + a₁ + 11r = 40
2a₁ + 26r = 62
2a₁ + 15r = 40 *(-1)
-2a₁ - 15r = - 40
11r = 22
r = 22/11
r = 2
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a₁₀ + a₁₈ = 62
a₅ + a₁₂ = 40
a₁ + 9r + a₁ + 17r = 62
a₁ + 4r + a₁ + 11r = 40
2a₁ + 26r = 62
2a₁ + 15r = 40 *(-1)
2a₁ + 26r = 62
-2a₁ - 15r = - 40
11r = 22
r = 22/11
r = 2