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x in (-oo:+oo)
(1/5)*x-2 = 13-(0.7*x)-25 // - 13-(0.7*x)-25
(1/5)*x+0.7*x-13-2+25 = 0
0.9*x+10 = 0 // - 10
0.9*x = -10 // : 0.9
x = -10/0.9
x = -11.11111111
x = -11.11111111
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