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(19+7*a)*8/5+85=261 cat este a

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Andriancik142
(19+7a)·8/5+85=261
(19+7·a)·8/5=261-85
(19+7·a)·8/5=176
(19+7·a)·1.6=176
19+7·a=176/1.6
19+7·a=110
7·a=110-19
7·a=91
a=91/7
a=13
Bya2000
(19+7*a)*8/5+85=261. (19+7*a)*8/5=176. (19+7*a)*8=176*5. (19+7*a)*8=880. 19+7*a=880:8. 19+7*a=110. 7*a=110-19 7*a=91 a=91:7 a=13

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