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42/(15+32)-(8*x^4)-13-12+42 = 0
42/(15+32)-8*x^4-13-12+42 = 0
-8*x^4 = -841/47 // : -8
x^4 = 841/376
x^4 = 841/376 // ^ 1/4
abs(x) = (841/376)^(1/4)
x = (841/376)^(1/4) or x = -(841/376)^(1/4)
x in { (841/376)^(1/4), -(841/376)^(1/4) }
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