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(3×y-5):4+(2+5-2×30):5=53

Răspuns :

(3×y-5):4+(2+5-2×30):5=53
(3y-5):4+(2+5-60)=53×5
(3y-5):4+(7-60)=265
(3y-5):4+(-53)=265
(3y-5):4-53=265
(3y-5):4=265+53
(3y-5):4=318
3y-5=318×4
3y-5=1272
3y=1272+5
3y=1277
y=1277:3
y=425,66