Question

determine o valor representado pela incógnita á seguir

Answer 1

Multiplicando Cruzado, temos:

$\frac{x+2}{4}=\frac{42}{14}\\\\14.(x+2)=4\;.\;42\\\\14x+28=168\\\\x=\frac{168-28}{14}\\\\x=\frac{140}{14}\\\\x=10$