Question

]676:13:(31 x 20-31-a)] x 45-23 x 91=247 Va rog ajutati

Answer 1

$[676:13:(31*20-31-a)]*45-23*91=247$

$[52:(620-31-a)]*45-2093=247$

$[52:(589-a)]*45=247+2093$

$\frac{52}{589-a} *45=2340$

$\frac{2340}{589-a} =2340$

$589-a = \frac{2340}{2340}$

$589-a = 1$

$-a=1-589$

$-a=-588|*(-1)$

$a=588$