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7*(-5*x-9) = 287 // - 287
7*(-5*x-9)-287 = 0
7*(-5*x-9)-287 = 0
-35*x-350 = 0
-35*x-350 = 0
-35*x-350 = 0 // + 350
-35*x = 350 // : -35
x = 350/(-35)
x = -10
x = -10
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