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x in (-oo:+oo)
-7*x-4 = 2*(4-((1/5)*x)) // - 2*(4-((1/5)*x))
-(2*(4-((1/5)*x)))-7*x-4 = 0
-2*((-1/5)*x+4)-7*x-4 = 0
-2*(4-1/5*x)-7*x-4 = 0
-2*(4-1/5*x)-7*x-4 = 0
-33/5*x-8-4 = 0
-33/5*x-12 = 0
-33/5*x-12 = 0
-33/5*x-12 = 0 // + 12
-33/5*x = 12 // : -33/5
x = 12/(-33/5)
x = -20/11
x = -20/11
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