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x in (-oo:+oo)
x/7 = 0.18 // - 0.18
x/7-0.18 = 0
1/7*x-0.18 = 0 // + 0.18
1/7*x = 0.18 // : 1/7
x = 0.18/1/7
x = 1.26000003
x = 1.26000003
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