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2*x+6 = (2*x+6)/2 // - (2*x+6)/2
2*x-((2*x+6)/2)+6 = 0
(-1*(2*x+6))/2+2*x+6 = 0
(-1*(2*x+6))/2+(2*2*x)/2+(2*6)/2 = 0
2*2*x-1*(2*x+6)+2*6 = 0
2*x-6+12 = 0
2*x+6 = 0
(2*x+6)/2 = 0
(2*x+6)/2 = 0 // * 2
2*x+6 = 0
2*x+6 = 0 // - 6
2*x = -6 // : 2
x = -6/2
x = -3
x = -3
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