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x in (-oo:+oo)
1.3*x = (3/8)*m // - (3/8)*m
1.3*x-((3/8)*m) = 0
(-3/8)*m+1.3*x = 0
1.3*x-3/8*m = 0 // + -3/8*m
1.3*x = -(-3/8*m) // : 1.3
x = (-(-3/8*m))/1.3
x = 0.28846154*m
x = 0.28846154*m
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