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4x - 5/2x=1/2 a -3
4x-2,5x=1/2 a -3
1,5x=1/2 a-3 /:3/2
x=1/2 ·2/3 a - 3· 2/3
x=1/3 a -2 a∈R
1/3a=x-2
a=3x-6