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x in (-oo:+oo)
(3/4)*x+3 = 7 // - 7
(3/4)*x-7+3 = 0
3/4*x-4 = 0 // + 4
3/4*x = 4 // : 3/4
x = 4/3/4
x = 16/3
x = 16/3
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