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x in (-oo:+oo)
(1/6)*x+0 = 700 // - 700
(1/6)*x-700+0 = 0
(1/6)*x-700 = 0
1/6*x-700 = 0 // + 700
1/6*x = 700 // : 1/6
x = 700/1/6
x = 4200
x = 4200
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