Question

4×[351:27×(9×a+5)-18]+43=1635

Answer 1

4×[351:27×(9×a+5)-18]+43=1635
4×[13×(9×a+5)-18] = 1 635-43
4×[13×(9×a+5)-18] = 1 592
13×(9×a+5)-18 = 1 592:4
13×(9×a+5)-18 = 398
13×(9×a+5) = 398+18
13×(9×a+5) = 416
9×a+5 = 416:13
9×a+5 = 32
9×a = 32 -5
9×a = 27
a = 27:9
a = 3