б)5(х+3)=12,5х
5x + 15 = 12.5x
5x – 12,5x = – 15
-7.5x = -15
x = 2
в)14+5х=4х+3
5x – 4x = 3 – 14
x = -11
г)3а+5=8а-15
3a – 8a = – 15 – 5
-5a = -20
a = 4
д)3,5+2х=5х+1,2
2x – 5x = 1,2 – 3,5
-3x = -2.3
-30x = -23
x = -23/-30
х=0,76666666666
е)4,2-2х=5,4+3х
– 2x – 3x = 5,4 – 4,2
-5x = 1.2
x = -0.24
ж)4(3-2х)+24=2(3+2х)
12 – 8x + 24 = 6 + 4x
– 8x – 4x = 6 – 24 – 12
-12x = -30
x = 2.5
з)0,2(5у-2)=0,3(2y-1)-0,3
y – 0.4 = 0.6y – 0.3 – 0.3
y – 0,6y = – 0,3 – 0,3 + 0,4
0.4y = -0.2
y = -0.5
б)5(х+3)=12,5х
5x + 15 = 12.5x
5x – 12,5x = – 15
-7.5x = -15
x = 2
в)14+5х=4х+3
5x – 4x = 3 – 14
x = -11
г)3а+5=8а-15
3a – 8a = – 15 – 5
-5a = -20
a = 4
д)3,5+2х=5х+1,2
2x – 5x = 1,2 – 3,5
-3x = -2.3
-30x = -23
x = -23/-30
х=0,76666666666
е)4,2-2х=5,4+3х
– 2x – 3x = 5,4 – 4,2
-5x = 1.2
x = -0.24
ж)4(3-2х)+24=2(3+2х)
12 – 8x + 24 = 6 + 4x
– 8x – 4x = 6 – 24 – 12
-12x = -30
x = 2.5
з)0,2(5у-2)=0,3(2y-1)-0,3
y – 0.4 = 0.6y – 0.3 – 0.3
y – 0,6y = – 0,3 – 0,3 + 0,4
0.4y = -0.2
y = -0.5