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x in (-oo:+oo)
x/5 = 6.5 // - 6.5
x/5-6.5 = 0
1/5*x-6.5 = 0 // + 6.5
1/5*x = 6.5 // : 1/5
x = 6.5/1/5
x = 32.5
x = 32.5
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