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Vamos paso a paso
Operando, tenemos
3x/4 + 3/2 - x/5 - 4 = 3/2x + 2
Reduciendo términos semejantes
3x/4 - x/5 + 3/2 - 4 - 2 = 3/2x
Edectuando
(5.3x - 4x)/20 + 3/2 - 6 = 3/2x
11x/20 + 3/2 - 12/2 = 3/2x
11x/20 - 9/2 = 3/2x
2x.11x/20 - 2x.9/2 = 3
22x^20 - 18x/2 = 3
(11/10x^2 - 9x = 3
multiplicando todo por 10
11x^2 - 90x = 30
11x^2 - 90x - 30 = 0 (ecuación cuadrática)
Aplicando la fórmula resolutiva
x = (- b +/- √Δ)/2a
Δ = b^2 - 4.a.c
= (-90)^2 - 4(11)(- 30)
= 8100 + 1320
= 9420
x = (90 +/- √9420)/2.11
= (90 +/- √(2^2.2355)/2.11
= (90 +/- 2√2355)2.11
dividiendo por 2
x = (45 +/- √2355)/11
x1 = (45 - √2355)/11
x2 = (45 + √2355)/11
S = {(45 - √2355)/11, (45 + √2355)/11}