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x in (-oo:+oo)
(2-x)/3+5 = 7 // - 7
(2-x)/3-7+5 = 0
(2-x)/3+(-7*3)/3+(3*5)/3 = 0
3*5-x-7*3+2 = 0
15-x-19 = 0
-x-4 = 0
(-x-4)/3 = 0
(-x-4)/3 = 0 // * 3
-x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x = -4
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