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x in (-oo:+oo)
(1/2)*(2*x-7) = 4 // - 4
(1/2)*(2*x-7)-4 = 0
1/2*(2*x-7)-4 = 0
1/2*(2*x-7)-4 = 0
x-15/2 = 0
x-15/2 = 0
x-15/2 = 0 // + 15/2
x = 15/2
x = 15/2
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