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x in (-oo:+oo)
3*(7*x+1) = 192 // - 192
3*(7*x+1)-192 = 0
3*(7*x+1)-192 = 0
21*x-189 = 0
21*x-189 = 0
21*x-189 = 0 // + 189
21*x = 189 // : 21
x = 189/21
x = 9
x = 9
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