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x in (-oo:+oo)
(1/210)*x-1 = 7 // - 7
(1/210)*x-7-1 = 0
1/210*x-8 = 0 // + 8
1/210*x = 8 // : 1/210
x = 8/1/210
x = 1680
x = 1680
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