Izračunaj X: $$ {\left\lbrack \matrix{2 & 12 \cr 4 & 5 } \right\rbrack} * \left\lbrack \matrix{1 & 7 \cr 0 & 1} \right\rbrack = ? $$ $$\int_1^ 12 (x + 5 )^ 7 dx + 12 x = 0 $$