5(3x-4)=7x+12怎么做

3X-5=12-7X \u6c42\u89e3\uff01 \u8bf7\u5feb\u70b9\uff01\uff01\uff01\uff01

3X-5=12-7X
3X+7X=12+5
10X=17
X=17/10
X=1.7

7x=-3x+5
7x+3x=-3x+5+3x
10x=5
x=0.5

5(3x-4)=7x+12
15x-20=7x+12
15x-7x=12+20
8x=32
x=32÷8
x=4

15x-20=7x+12
15x-7x=20+12
8x=32
x=4

5(x鈥4)鈥7(7鈥搙)=12鈥3(9鈥搙)+9
绛旓細瑙ｆ柟绋 5(x鈥4)鈥7(7鈥搙)=12鈥3(9鈥搙)+9 5x-20-49+7x=12-27+3x+9 12x-69=3x-6 12x-3x=69-6 9x=63 瑙ｅ緱x=63/9=7

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