a1 = 2x +1
a2 = 12x = a1+r = 2x + 1 +r r = 10x -1
a4 = 14x + y
a4 = 14x + 116 = a1 +3r = 2x + 1 + 3(10x-1)
14x + 116 = 2x + 1 + 30x -3
116 - 1 + 3 = 2x +30x - 14x
118 = 18 x
x = 118/18 = 59/9
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a1 = 2x +1
a2 = 12x = a1+r = 2x + 1 +r r = 10x -1
a4 = 14x + y
a4 = 14x + 116 = a1 +3r = 2x + 1 + 3(10x-1)
14x + 116 = 2x + 1 + 30x -3
116 - 1 + 3 = 2x +30x - 14x
118 = 18 x
x = 118/18 = 59/9