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7-3*x-(3*x) = 10 // - 10
7-3*x-(3*x)-10 = 0
7-3*x-3*x-10 = 0
-6*x-3 = 0 // + 3
-6*x = 3 // : -6
x = 3/(-6)
x = -1/2
x = -1/2
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