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x in (-oo:+oo)
x/5 = 6.75/9 // - 6.75/9
x/5-(6.75/9) = 0
x/5-0.75 = 0
1/5*x-0.75 = 0 // + 0.75
1/5*x = 0.75 // : 1/5
x = 0.75/1/5
x = 3.75
x = 3.75
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