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(5/3)*x+(1/3)*x = (7/3)*x+211/3 // - (7/3)*x+211/3
(5/3)*x+(1/3)*x-((7/3)*x)-(211/3) = 0
(5/3)*x+(1/3)*x+(-7/3)*x-211/3 = 0
-1/3*x-211/3 = 0 // + 211/3
-1/3*x = 211/3 // : -1/3
x = 211/3/(-1/3)
x = -211
x = -211
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