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a in (-oo:+oo)
2*(-(3*a)-7) = 10 // - 10
2*(-(3*a)-7)-10 = 0
2*(-3*a-7)-10 = 0
2*(-3*a-7)-10 = 0
-6*a-24 = 0
-6*a-24 = 0
-6*a-24 = 0 // + 24
-6*a = 24 // : -6
a = 24/(-6)
a = -4
a = -4
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