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x in (-oo:+oo)
(2*x+744)/3 = 840 // - 840
(2*x+744)/3-840 = 0
(2*x+744)/3+(-840*3)/3 = 0
2*x-840*3+744 = 0
2*x-1776 = 0
(2*x-1776)/3 = 0
(2*x-1776)/3 = 0 // * 3
2*x-1776 = 0
2*x-1776 = 0 // + 1776
2*x = 1776 // : 2
x = 1776/2
x = 888
x = 888
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