6 (x + 2.8) = 40.8 9x-0.4 * 2.5 = 9.8 (5.6 + x) * 4 = 56

6（x+2.8）=40.8 9x-0.4*2.5=9.8 （5.6+x）*4=566x+16.8=40.8 9x-1=9. 5.6*4+4x=56 6x=24 9x=10.8 ...

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