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x in (-oo:+oo)
(1/5)*x+1/7 = 30 // - 30
(1/5)*x+1/7-30 = 0
1/5*x-209/7 = 0 // + 209/7
1/5*x = 209/7 // : 1/5
x = 209/7/1/5
x = 1045/7
x = 1045/7
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