2(3y-4)+7(4-y)=4y
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2(3y-4)+7(4-y)=4y
2(3y-4)+7(4-y)=4y
2(3y-4)+7(4-y)=4y
2(3y-4)+7(4-y)=4y
6y-8+28-7y=4y
6y-7y-4y=-28+8
-5y=-20
y=20/5
y=4
解法如下:
6y-8+28-7y=4y
20-y=4y
5y=20
y=4
y=4
6y-8+28-7y=4y
5y=20
y=4
6y-8+28-7y=4y
20-y=4y
20=5y
y=4
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