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x in (-oo:+oo)
(2/7)*(4*x-18) = 20 // - 20
(2/7)*(4*x-18)-20 = 0
2/7*(4*x-18)-20 = 0
2/7*(4*x-18)-20 = 0
8/7*x-176/7 = 0
8/7*x-176/7 = 0
8/7*x-176/7 = 0 // + 176/7
8/7*x = 176/7 // : 8/7
x = 176/7/8/7
x = 22
x = 22
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