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x in (-oo:+oo)
x-((3*x)/9)-(5/4)-4 = 13 // - 13
x-((3*x)/9)-(5/4)-13-4 = 0
x+(-1/3)*x-5/4-13-4 = 0
2/3*x-73/4 = 0 // + 73/4
2/3*x = 73/4 // : 2/3
x = 73/4/2/3
x = 219/8
x = 219/8
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