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187 -{ 220 x [(11 x 9 - 735 : 15 ): x - 53 } = 20 

Răspuns :

187 -{ 220 x [(11 x 9 - 735 : 15 )]: x - 53 } = 20
{ 220 x [(99 - 49 ): x] - 53 } = 187-20
220 x [50: x] - 53=167
220 x [50: x]=167+53
220 x [50: x]220
50:x=220:220
50:x=1
x=50:1
x=50