Question

Determinati valorile lui a din:
[676:13:(31x20-31-a)]x45-23x91=247

Answer 1

    [576 : 13 : (31 x 20 - 31 - a)] x 45 - 23 x 91 = 247  =>
=>[52 : (589 - a)] x 45 - 23 x 91 = 247  =>
=>52 / (589 - a) x 45 - 2093 = 247  =>
=>2340/(589 - a) = 247 + 2093  =>
=>2340/(589 - a) = 2340  =>
=>589 - a = 2340/2340  =>
=>589 - a = 1  =>
=>-a = - 588  =>
=>a = 588