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q in (-oo:+oo)
q/7 = 56.8 // - 56.8
q/7-56.8 = 0
1/7*q-56.8 = 0 // + 56.8
1/7*q = 56.8 // : 1/7
q = 56.8/1/7
q = 397.60000795
q = 397.60000795
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