Question
$$-2(8x+1)-1 = -2(8x+1)-1$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} -2(8x+1)-1 &= -2(8x+1)-1&& \text{simplify left and right hand side} \\[1 em]-(16x+2)-1 &= -(16x+2)-1&& \\[1 em]-16x-2-1 &= -16x-2-1&& \\[1 em]-16x-3 &= -16x-3&& \text{move the $ \color{blue}{ -16x } $ to the left side and $ \color{blue}{ -3 }$ to the right} \\[1 em]-16x+16x &= -3+3&& \text{simplify left and right hand side} \\[1 em]-16x+16x &= 0&& \\[1 em]0 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 0 = 0 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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