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150/7 = 6*x-3*x+3/7 // - 6*x-3*x+3/7
150/7-(-3*x)-(6*x)-(3/7) = 0
3*x-6*x+150/7-3/7 = 0
21-3*x = 0 // - 21
-3*x = -21 // : -3
x = -21/(-3)
x = 7
x = 7
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