Question

Решите уравнение:
а) 4х-13=6х+7
б) 5(х+3)=12,5х
в) 14+5х=4х+3
г) 3а+5=8а-15

Answer 1

1) 4х-13=6х+7
4x-6x=7+13
-2x=20
x=-10
2)5(х+3)=12,5х
5x+15=12.5x
5x-12.5x=15
6.5x=15
x=15/6.5
x=2.30

3)14+5х=4х+3
14-3=4x-5x
11=1x
x=-11
4)3а+5=8а-15
3a-8a=-15-5
-5a=-20
a=4

Answer 2

4x-13=6x+7
4x-6x=7+13
-2x=20
x=20;(-2)
x=-10

5(x+3)=12,5x
5x+15=12,5x
5x-12,5x=-15
-7,5x=-15
x =(-15):(-7,5)
x=2

14+5x=4x+3
5x-4x=3-14
x=-11

3a+5=8a-15
3a-8a=-15-5
-5a=-20
a=(-20):(-5)
a=4