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x in (-oo:+oo)
(7*x+3*x)/5 = 10 // - 10
(7*x+3*x)/5-10 = 0
(10*x)/5-10 = 0
(10*x)/5+(-10*5)/5 = 0
10*x-10*5 = 0
10*x-50 = 0
(10*x-50)/5 = 0
(10*x-50)/5 = 0 // * 5
10*x-50 = 0
10*x-50 = 0 // + 50
10*x = 50 // : 10
x = 50/10
x = 5
x = 5
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