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(-5/2)*x+(3/4)*x-(-7/4) = 0
(-5/2)*x+(3/4)*x+7/4 = 0
7/4-7/4*x = 0 // - 7/4
-7/4*x = -7/4 // : -7/4
x = -7/4/(-7/4)
x = 1
x = 1
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