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x in (-oo:+oo)
(x-7)/(10-7) = 0.9 // - 0.9
(x-7)/(10-7)-0.9 = 0
(x-7)/3-0.9 = 0
(x-7)/3+(-0.9*3)/3 = 0
x-0.9*3-7 = 0
x-9.7 = 0
(x-9.7)/3 = 0
(x-9.7)/3 = 0 // * 3
x-9.7 = 0
x-9.7 = 0 // + 9.7
x = 9.7
x = 9.7
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