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(1/2)*(4*x+6)-2 = -(5*x+9) // + 5*x+9
(1/2)*(4*x+6)+5*x-2+9 = 0
1/2*(4*x+6)+5*x-2+9 = 0
1/2*(4*x+6)+5*x-2+9 = 0
7*x-2+3+9 = 0
7*x+1+9 = 0
7*x+10 = 0
7*x+10 = 0
7*x+10 = 0 // - 10
7*x = -10 // : 7
x = -10/7
x = -10/7
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