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(-3/2)*x+(3/4)*x = -21/8 // + -21/8
(-3/2)*x+(3/4)*x-(-21/8) = 0
(-3/2)*x+(3/4)*x+21/8 = 0
21/8-3/4*x = 0 // - 21/8
-3/4*x = -21/8 // : -3/4
x = -21/8/(-3/4)
x = 7/2
x = 7/2
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