$$6(3a-1)+3(2a+3)=1-7a$$
$a=-\frac{2}{31}\approx -0.064516129$
$$18a-6+3\left(2a+3\right)=1-7a$$
$$18a-6+6a+9=1-7a$$
$$24a-6+9=1-7a$$
$$24a+3=1-7a$$
$$24a+3+7a=1$$
$$31a+3=1$$
$$31a=1-3$$
$$31a=-2$$
$$a=\frac{-2}{31}$$
$$a=-\frac{2}{31}$$
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