3/4X+1/2X=75

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3/4X+1/2X=75
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3/4X+1/2X=75
3/4X+1/2X=75

3/4X+1/2X=75
3/4X+1/2X=75
5/4x=75
x=75÷5/4
x=60

3/4x+2/4x=75
5/4x=75
x=75*4/5
x=60

3/4x+2/4x=75
5/4x=75
300x=5
x=1/60