1°) Resolva as expressões algébricas, substituindo a variável por seu respectivo valor:

a) Quando a = 5
• 8a+3 (a-2)


• 5a+a+2a

b) Quando x = 8
• x+4


• 8x-3



 \frac{2x}{5}


• 10x-6


• 2x



 \frac{4x + 16}{4}


• (x+x)÷3


• (x+5) + (x-5)
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