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x in (-oo:+oo)
(1*x)/3 = 310 // - 310
(1*x)/3-310 = 0
x/3-310 = 0
1/3*x-310 = 0 // + 310
1/3*x = 310 // : 1/3
x = 310/1/3
x = 930
x = 930
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