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42-((2*x)/7) = x // - x
42-((2*x)/7)-x = 0
(-2/7)*x-x+42 = 0
42-9/7*x = 0 // - 42
-9/7*x = -42 // : -9/7
x = -42/(-9/7)
x = 98/3
x = 98/3
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