Question

23-2 ori [15-(74-2 ori x ) :4+3] = 9  

Answer 1

23- 2*[15-(74-2*x):4+3]=9
2*[15-(74-2*x):4+3]=23-9
2*[15-(74-2*x):4+3]=14
15-(74-2*x):4+3=14:2
15-(74-2*x):4+3=7
15-(74-2*x):4=7-3
15-(74-2*x):4=4
(74-2*x):4=15-4
(74-2*x):4=11
74-2*x=11 * 4
74-2*x=44
2*x=74-44
2*x=30
x=30:2
x=15