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x in (-oo:+oo)
(3/10)*(x-10) = 200 // - 200
(3/10)*(x-10)-200 = 0
3/10*(x-10)-200 = 0
3/10*(x-10)-200 = 0
3/10*x-203 = 0
3/10*x-203 = 0
3/10*x-203 = 0 // + 203
3/10*x = 203 // : 3/10
x = 203/3/10
x = 2030/3
x = 2030/3
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