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x in (-oo:+oo)
(1/3)*x+1/2 = 4 // - 4
(1/3)*x+1/2-4 = 0
1/3*x-7/2 = 0 // + 7/2
1/3*x = 7/2 // : 1/3
x = 7/2/1/3
x = 21/2
x = 21/2
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