Ответ: 1). -4; 2). 4; 3). 10.
Решение:
1). -5x = 20; x = 20/-5 = -4.
2). x + 1 = 5; x = 5 - 1 = 4.
3). x - 3 = 7; x = 7 + 3 = 10.
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Ответ: 1). -4; 2). 4; 3). 10.
Решение:
1). -5x = 20; x = 20/-5 = -4.
2). x + 1 = 5; x = 5 - 1 = 4.
3). x - 3 = 7; x = 7 + 3 = 10.
X=20/(-5)
X=(-4)
X+1=5 X=5-1 X=4
X-3=7 X=7+3 X=10