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x in (-oo:+oo)
-23 = 4-x/7 // - 4-x/7
-(-x/7)-23-4 = 0
(1/7)*x-23-4 = 0
1/7*x-27 = 0 // + 27
1/7*x = 27 // : 1/7
x = 27/1/7
x = 189
x = 189
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