a₃₆ = - 15 d = - 3 a₁ = ?
a₃₆ = a₁ + 35d
a₁ = a₃₆ - 35d = - 15 - 35 * (- 3) = - 15 + 105 = 90
a₁ = 90
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a₃₆ = - 15 d = - 3 a₁ = ?
a₃₆ = a₁ + 35d
a₁ = a₃₆ - 35d = - 15 - 35 * (- 3) = - 15 + 105 = 90
a₁ = 90