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x in (-oo:+oo)
-(7*(-((38*x)/63)-315))-3*x = 21 // - 21
-(7*(-((38*x)/63)-315))-3*x-21 = 0
-7*((-38/63)*x-315)-3*x-21 = 0
-7*(-38/63*x-315)-3*x-21 = 0
-7*(-38/63*x-315)-3*x-21 = 0
11/9*x-21+2205 = 0
11/9*x+2184 = 0
11/9*x+2184 = 0
11/9*x+2184 = 0 // - 2184
11/9*x = -2184 // : 11/9
x = -2184/11/9
x = -19656/11
x = -19656/11
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