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Calcular preços

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Eu tenho uma texbox_1(custo), textbox_2(desconto) e uma label(total a pagar) e gostaria que ao colocar o preço na textbox_1 e ao colocar um desconto na textbox_2 me aparecesse a subtração na label. Caso não tenha desconto que apareça na label o custo que é o valor da textbox_1.

Alguem me pode ajudar.


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