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13-((9/10)*x) = 7 // - 7
13-((9/10)*x)-7 = 0
(-9/10)*x-7+13 = 0
13-9/10*x-7 = 0 // - 13-7
-9/10*x = -(13-7) // : -9/10
x = (-(13-7))/(-9/10)
x = -10/9*(7-13)
x = -10/9*(7-13)
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