x = 25
x = -25
x =19
x = 9
x = 4
Пошаговое объяснение:
25+x = 75-x => 2x = 50 => x = 25
4x+56 = 31+3x => x = -25
3x-84 = 11-2x => 5x = 95 => x = 19
10x+1 = 12x-17 => 18 = 2x => x = 9
3a+5=8a-15 => 20 = 5a => a = 4
25+х=75-х. 4х+56=31+3х
х+х=75-25. 4х-3х=31-56=
2х=50. х=-25
х=25
3х-84=11-2х. 10х+1=12х-17
3х+2х=11+84. 10х-12х= -17-1
5х=95. -2х=-18
х=95÷5. х=(-18)÷(-2)
х=19. х=9
3а+5=8а-15
3а-8а=-15-5
-5а=-20
а=(-20)÷(-5)
а=4
