28 + x = 13 / –28
28 + x +–28= 13 + –28
x + 0 = –15
x = –15
2x + 5 + –5 = 4x - 1 + –5
2x + 0 = 4x + –6
2x = 4x + –6
2x = 4x + –6 / –4x
2x + –4x = 4x + –6 + –4x
– 2x = 4x + –4x + –6
– 2x = 0 + –6
– 2x = –6
ecuaciones multiplicativas.
3 • x = 81
3 • x = 81 / :3
3 • x : 3 = 81 : 3
3 : 3 • x = 27
1 • x = 27
x = 27
15 : 15 • x = 75 : 15
1 • x = 5
x = 5
3 · x = 81
3 · x = 81 / :3
3 · x : 3 = 81 : 3
3 : 3 · x = 27
1 · x = 27
x = 27
3 · x = 81 / :3
3 · x : 3 = 81 : 3
3 : 3 · x = 27
1 · x = 27
x = 27
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