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question no 2
3x-7=x-5
3x-x=-5+7
2x=2
x=2/2
x=1
question no 3
4y/5+2=y
4y+2=5×y
4y+2=5y
4y-5y=-2
-y=-2
y=2
question 4
4x-9/6=x-2x+2/2
4x-9×2=x-2x+2×6
4x-18=x-2x+12
4x-x+2x=30
3x+2x=30
5x=30
x=30/5
x=6
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