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a in (-oo:+oo)
4*a-(2*(a+3))+8/2 = 0
4*a-2*(a+3)+8/2 = 0
4*a-2*(a+3)+4 = 0
4*a-2*(a+3)+4 = 0
2*a-6+4 = 0
2*a-2 = 0
2*a-2 = 0
2*a-2 = 0 // + 2
2*a = 2 // : 2
a = 2/2
a = 1
a = 1
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