Question

13х(87+12х)+26=1 пж ришите буду блогодарин

Answer 1

1)87+12=99
2)13х99=1287
3)1287+26=1313

Answer 2

13х (87 + 12х) + 26 = 1; 1131 + 156х + 26 = 1; 1157 + 156х = 1; 156х = 1 - 1157; 156х = - 1156; х = - 7 64/156; х = - 7 16/39.