Суравнениями: 5(8х+3)-12=83 7(2х+9)+3х=114 3(4х+13)-25=74 заранее !

5(8х+3)-12=83
40х + 15 - 12 = 83
40х = 83 - 15 + 12
40х = 80
х = 80 : 40
х = 2

7(2х+9)+3х=114
14х + 63 + 3х = 114
14х + 3х + 114 - 63
17х = 51
х = 51 : 17
х = 3

3(4х+13)-25=74
12х + 39 - 25 = 74
12х = 74 - 39 + 25
12х = 60
х = 60 : 12
х = 5

5(8x+3)-12=83
40x+15-12=83
40x=83-15+12
40x=80
x=80:40
x=2

7(2x+9)+3x=114
14x+63+3x=114
17x=114-63
17x=51
x=51:17
x=3

3(4x+13)-25=74
12x+39-25=74
12x=74-39+25
12x=60
x=60:12
x=5