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x in (-oo:+oo)
(1/2)*(4*x-6) = 4*x+15 // - 4*x+15
(1/2)*(4*x-6)-(4*x)-15 = 0
(1/2)*(4*x-6)-4*x-15 = 0
1/2*(4*x-6)-4*x-15 = 0
1/2*(4*x-6)-4*x-15 = 0
-2*x-15-3 = 0
-2*x-18 = 0
-2*x-18 = 0
-2*x-18 = 0 // + 18
-2*x = 18 // : -2
x = 18/(-2)
x = -9
x = -9
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