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x in (-oo:+oo)
x/30 = 7/12 // - 7/12
x/30-(7/12) = 0
x/30-7/12 = 0
1/30*x-7/12 = 0 // + 7/12
1/30*x = 7/12 // : 1/30
x = 7/12/1/30
x = 35/2
x = 35/2
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