Question

alguém que saiba, me responde???

Answer 1

$a)\dfrac{x}{3}+ \dfrac{x}{2} =15 ~~~~~~~~~~~~~~~~~~c) \dfrac{5x}{6} +\dfrac{2}{3} =\dfrac{5x}{4}-1 \\ \\ ~~\dfrac{2x+3x}{6} = \dfrac{90}{6} ~~~~~~~~~~~~~~~~~~ \dfrac{10x+8}{12} = \dfrac{15x-12}{12} \\ \\ 5x=90 ~~~~~~~~~~~~~~~~~~~~~~~~~~~10x+8=15x-12\\ \\ x= \dfrac{90}{5}~\therefore x=18~~~~~~~~~~~~~~~8+12=15x-10 x \\ \\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~5x=20\to ~x= \dfrac{20}{5} ~~\therefore x=4\\ \\ .$