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19-((5/4)*x) = 4 // - 4
19-((5/4)*x)-4 = 0
(-5/4)*x-4+19 = 0
15-5/4*x = 0 // - 15
-5/4*x = -15 // : -5/4
x = -15/(-5/4)
x = 12
x = 12
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