Question
$$2x-x+7 = x+3+4$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 2x-x+7 &= x+3+4&& \text{simplify left and right hand side} \\[1 em]x+7 &= x+7&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]x-x &= 7-7&& \text{simplify left and right hand side} \\[1 em]x-x &= 0&& \\[1 em]0 &= 0&& \\[1 em] \end{aligned} $$
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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