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 (7x+3)/(2)+(x+6)/(4)=18     multiply through by the common denominator of 2 and 4, i.e., 4

(7x + 3)(2)  + (x + 6)   = 72        distribute the 2 over the terms in the parentheses

14x + 6  + x + 6   = 72       simplify

15x + 12   = 72      subtract 12 from both sides

15x   = 60      divide both sides by 15

x = 4