Question

aflati valoarea x {[(27x X - 79)x61-78]x15+340}:250=4

Answer 1

{[(27x-79)*61-78]*15+340}=4*250
{[(27x-79)*61-78]*15+340}=1000
[(27x-79)*61-78]*15=1000-340
[(27x-79)*61-78]*15=660
[(27x-79)*61-78]=660:15

[(27x-79)*61-78]=44


(27x-79)*61=44+78
(27x-79)*61=122

27x-79=122:61
27x-79=2
27x=79+2
27x=81
x=81:27
x=3