Question
$$251 = 98-x$$
Answer
$$ x = -153 $$
Explanation
$$ \begin{aligned} 251 &= 98-x&& \text{ swap the left and right side of the equation } \\[1 em]98-x &= 251&& \text{ move 98 to the right } \\[1 em]-x &= 251-98&& \\[1 em]-x &= 153&& \text{switch signs on both sides} \\[1 em]x &= -153&& \\[1 em] \end{aligned} $$
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