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x in (-oo:+oo)
x/6 = 8.7 // - 8.7
x/6-8.7 = 0
1/6*x-8.7 = 0 // + 8.7
1/6*x = 8.7 // : 1/6
x = 8.7/1/6
x = 52.19999896
x = 52.19999896
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