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4(4+2a)=5(a+2)
16+8a=5a+10
8a-5a=10-16
3a=-6 /:3
a=-2
(4 + 2a) / 10 = (a + 2) / (5 + 3)
To mamy:
(4 + 2a) / 10 = (a + 2) / (5 + 3) (mnożenie obustronne) / 40
16 + 8a = 5a + 10
8a - 5a = 10 -16
3a = -6 //3
a = - 2