[tex] \boxed{\boxed{\bf{\red{Olá }}}}[/tex]
Vamos a os cálculos
[(x-15)×(x+7)]/(x-3)=0
(x-15)×(x+7)÷(x-3)=0, x≠3
(x-15)×(x+7)=0 /x-3
x²+7x-15x-105=0/x-3
x²-8x-105=0
x²+7x-15x-105=0
x×(x+7)-15(x+7)=0
x+7=0
x-15=0
x=-7
x=15
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-7+15=
+(15-7)=
8
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Resposta ☞︎︎︎ 8
