Question

Determine o valor de x na proporção x+3/x-4=12/6

Answer 1

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$\frac{x+3}{x-4} = \frac{12}{6} \\ \\ 12(x-4)=6(x+3) \\ \\ 12x-48=6x+18 \\ \\ 12x-6x=18+48 \\ \\ 6x=66 \\ \\ x=66\div6 \\ \\ x=11$