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X- (X-2Y) = X+2Y-X=b
2y=2y=b
Un = a +(n-1)b
x+18y = x-2y + (n-1)2y
x+18y-x+2y= 2yn-2y
20y=2yn-2y
22y=2yn
n=11
semoga bermanfaat :)