3x-7(x-1)=3-2(x+3).
去括号得:3x-7x+7=3-2x-6
移项:得3x-7x+2x=3-6-7
合并同类项得:-2x=-10
系数化为1得:x=5.
能产生卵细胞,并且分泌雌性激素的器官是子宫.______(判断对错)
We will go to the mountains,if it______this Saturday.
A.doesn’t rain
B.won’t rain
C.isn’t raining
D.didn’t rain