Решите уравнения 3(x+5)=7-5x4(x-9)=3(x-8)=7(3-2x)=15(1-x)13-(2x-5)=x-326-(17-2x)=5x

Question

Решите уравнения
3(x+5)=7-5x
4(x-9)=3(x-8)=
7(3-2x)=15(1-x)
13-(2x-5)=x-3
26-(17-2x)=5x

Answer 1

3(х + 5)= 7-5х
3х + 15 = 7 - 5х
3х +5х = 7 - 15
8х= -8
х= -8 : 8
х= -1

4(х - 9) = 3(х-8)
4х - 36 = 3х - 24
4х - 3х = -24 + 36
-1х = 12
х= 12 : -1
х = -12

Comments

почему -1