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8x + 16 = 28
8x = 28-16
8x = 12
x = 12/8
x = 1.5
comprobándolo es:
8(1.5+2) = 28
8*3.5 = 28
28 = 28 bien
2)
5(3+x) = 50
15+5x = 50
5x = 50-15
5x = 35
x = 35/5
x = 7
comprobándolo:
5(3+7) = 50
5*10 = 50
50 = 50 bien....
Saludos...