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5xf-(926-203x3)-13=500

Răspuns :

5xf-(926-203x3)-13=500
5f - (926 - 609) = 500 + 13 
5f - 317 = 513 
5f = 513 + 317 
5f = 830 
f = 830 : 5 
f = 166
5×f-(926-609)-13=500
5×f-317-13=500
5×f=500+317+13
5×f=830
f=166