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X in (-oo:+oo)
X/90-2723 = 2700 // - 2700
X/90-2723-2700 = 0
1/90*X-5423 = 0 // + 5423
1/90*X = 5423 // : 1/90
X = 5423/1/90
X = 488070
X = 488070
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