$$-98 = 4x-50$$
Answer
$$ x = -12 $$
Explanation
$$ \begin{aligned} -98 &= 4x-50&& \text{ swap the left and right side of the equation } \\[1 em]4x-50 &= -98&& \text{ move -50 to the right } \\[1 em]4x &= -98+50&& \\[1 em]4x &= -48&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= -\frac{48}{4}&& \\[1 em]x &= -12&& \\[1 em] \end{aligned} $$
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