$$\frac { x - 1 } { 8 } = \frac { x + 6 } { 7 }$$
$x=-55$
$$7\left(x-1\right)=8\left(x+6\right)$$
$$7x-7=8\left(x+6\right)$$
$$7x-7=8x+48$$
$$7x-7-8x=48$$
$$-x-7=48$$
$$-x=48+7$$
$$-x=55$$
$$x=-55$$
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