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10-3*x = 7*x-40 // - 7*x-40
10-3*x-(7*x)+40 = 0
10-3*x-7*x+40 = 0
50-10*x = 0 // - 50
-10*x = -50 // : -10
x = -50/(-10)
x = 5
x = 5
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