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x in (-oo:+oo)
x/4 = 7.2 // - 7.2
x/4-7.2 = 0
1/4*x-7.2 = 0 // + 7.2
1/4*x = 7.2 // : 1/4
x = 7.2/1/4
x = 28.8
x = 28.8
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