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The problem is
[tex]-40+7p=3+5(8p-2);p=-1[/tex]To solve this problem, we need to replace the numerical value of p, and see if it satisfies. After replacing the value, we will solve the parenthesis first
[tex]-40+7(-1)=3+5(8(-1)-2)[/tex][tex]-40-7=3+5(-8-2)[/tex][tex]-47=3+5(-10)\rightarrow-47=3-15\rightarrow-47=-12[/tex]As you can observe, the value -1 for p doesn't satisfy the equation, that means, it's not a solution.