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x in (-oo:+oo)
X/3-(x/5) = 7 // - 7
X/3-(x/5)-7 = 0
1/3*X-1/5*x-7 = 0 // - 1/3*X-7
-1/5*x = -(1/3*X-7) // : -1/5
x = (-(1/3*X-7))/(-1/5)
x = -5*(7-(1/3*X))
x = -5*(7-(1/3*X))
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