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x in (-oo:+oo)
x/40 = 3/4 // - 3/4
x/40-(3/4) = 0
x/40-3/4 = 0
1/40*x-3/4 = 0 // + 3/4
1/40*x = 3/4 // : 1/40
x = 3/4/1/40
x = 30
x = 30
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