21 + x = 4/7 . (45 + x)
(21 + x) . 7 = 4 . (45 + x)
147 + 7x = 180 + 4x
7x - 4x = 180 - 147
3x = 33
x = 33 : 3
x = 11
Espero que te haya ayudado :3
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21 + x = 4/7 . (45 + x)
(21 + x) . 7 = 4 . (45 + x)
147 + 7x = 180 + 4x
7x - 4x = 180 - 147
3x = 33
x = 33 : 3
x = 11
Espero que te haya ayudado :3