2(3x-4)+7(4-x)=0
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2(3x-4)+7(4-x)=02(3x-4)+7(4-x)=02(3x-4)+7(4-x)=06x-8+28-7x=06x-7x=8-28-x=-20x=20x=202(3x-4)+7(4-x)=0
2(3x-4)+7(4-x)=0
2(3x-4)+7(4-x)=0
2(3x-4)+7(4-x)=0
6x-8+28-7x=0
6x-7x=8-28
-x=-20
x=20
x=20
2(3x-4)+7(4-x)=0
6x-8+28-7x=0
-x+20=0
x=20
x=14
去括号:6x-8+28-7x=0
移项:6x-7x=0+8-28
合并同类项:-x=-20
系数化为1:x=20 老师说得还不够明白吗,多听课嘛,数学全靠听不听课的。
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