Question Number 45811 by gunay last updated on 17/Oct/18
$$\left(\mathrm{18}+\mathrm{5x}\right)×\mathrm{3}=\mathrm{309} \\ $$
Answered by Rauny last updated on 17/Oct/18
$$\mathrm{3}\left(\mathrm{18}+\mathrm{5}{x}\right)=\mathrm{309} \\ $$$$\mathrm{18}+\mathrm{5}{x}=\mathrm{103} \\ $$$$\mathrm{5}{x}=\mathrm{103}−\mathrm{18}=\mathrm{85} \\ $$$${x}=\mathrm{17} \\ $$