5(x-8)=3x 7(x+10)=5(4x-10) x-10=[2(x-10)-9]x5

问题描述:

5(x-8)=3x 7(x+10)=5(4x-10) x-10=[2(x-10)-9]x5

5(x-8)=3x
5x-40=3x
2x=40
x=20

7(x+10)=5(4x-10)
7x+70=20x-50
13x=120
x=120/13
x-10=[2(x-10)-9]x5
x-10=10x-145
9x=135
x=15

5(x-8)=3x 5x-40=3x5x-3x=402x=40x=40/2x=207(x+10)=5(4x-10) 7x+70=20x-5070+50=20x-7x14x=120x=120/14x=60/7x-10=[2(x-10)-9]x5x-10=(2x-29)x5x-10=10x-145145-10=10x-x9x=135x=135/9x=15