x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20

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x-(1/5+1/5)x-39=39x-1/4x-2/5x=112x-1/6x-1/3x-12=20x-(1/5+1/5)x-39=39x-1/4x-2/5x=112x-1/6x-1/3x-12=20

x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20
x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20

x-(1/5+1/5)x-39=39 x-1/4x-2/5x=112 x-1/6x-1/3x-12=20
x-(1/5+1/5)x-39=39
x-2/5x=39+39
3/5x=78
x=78÷3/5
x=130
x-1/4x-2/5x=112
(1-1/4-2/5)x=112
7/20x=112
x=112÷7/20
x=320
x-1/6x-1/3x-12=20
(1-1/6-1/3)x=20+12
1/2x=32
x=32÷1/2
x=64