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x in (-oo:+oo)
(1/2)*(4*x+2) = -13 // + 13
(1/2)*(4*x+2)+13 = 0
1/2*(4*x+2)+13 = 0
1/2*(4*x+2)+13 = 0
2*x+14 = 0
2*x+14 = 0
2*x+14 = 0 // - 14
2*x = -14 // : 2
x = -14/2
x = -7
x = -7
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