$$0 = 1.75x+2.5$$
Answer
$$ x = -2 $$
Explanation
$$ \begin{aligned} 0 &= 1.75x+2.5&& \text{simplify right side} \\[1 em]0 &= x+2.5&& \text{ swap the left and right side of the equation } \\[1 em]x+2.5 &= 0&& \text{ move the constants to the right } \\[1 em]x &= -2&& \\[1 em]x &= -2&& \\[1 em] \end{aligned} $$
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