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x in (-oo:+oo)
(1/2)*(10-(1*x))+4 = 18 // - 18
(1/2)*(10-(1*x))-18+4 = 0
(1/2)*(10-x)-18+4 = 0
1/2*(10-x)-18+4 = 0
1/2*(10-x)-18+4 = 0
4-1/2*x-13 = 0
-1/2*x-9 = 0
-1/2*x-9 = 0
-1/2*x-9 = 0 // + 9
-1/2*x = 9 // : -1/2
x = 9/(-1/2)
x = -18
x = -18
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