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21-((16-(5*x))/2) = 0
21-((16-5*x)/2) = 0
(-1*(16-5*x))/2+21 = 0
(-1*(16-5*x))/2+(2*21)/2 = 0
2*21-1*(16-5*x) = 0
5*x+26 = 0
(5*x+26)/2 = 0
(5*x+26)/2 = 0 // * 2
5*x+26 = 0
5*x+26 = 0 // - 26
5*x = -26 // : 5
x = -26/5
x = -26/5
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