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x in (-oo:+oo)
X/7+x/8 = 15/56 // - 15/56
X/7+x/8-(15/56) = 0
X/7+x/8-15/56 = 0
1/7*X+1/8*x-15/56 = 0 // - 1/7*X-15/56
1/8*x = -(1/7*X-15/56) // : 1/8
x = (-(1/7*X-15/56))/1/8
x = 8*(15/56-(1/7*X))
x = 8*(15/56-(1/7*X))
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