6x + 12 = 42 | -126x = 30 | : 6x = 5-3x + 13 = 7 | -13-3x = -6 | : (-3)x = 29 + 2x = 31 | -92x = 22 | : 2x = 11-19 + 4x = -23 | +194x = -4 | : 4x = -18x - 9 = 1 | +98x = 10 | :8x = 1,2540 - 6x = 28 | -40-6x = -12 | : (-6)x = 2
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6x + 12 = 42 | -12
6x = 30 | : 6
x = 5
-3x + 13 = 7 | -13
-3x = -6 | : (-3)
x = 2
9 + 2x = 31 | -9
2x = 22 | : 2
x = 11
-19 + 4x = -23 | +19
4x = -4 | : 4
x = -1
8x - 9 = 1 | +9
8x = 10 | :8
x = 1,25
40 - 6x = 28 | -40
-6x = -12 | : (-6)
x = 2
6x = 42 -12
6x = 30 / :6
x = 5
-3x + 13 = 7
13 - 7 = 3x
6 = 3x / :3
2 = x
x = 2
9 + 2x = 31
2x = 31 -9
2x = 22 / :2
x = 11
-19 + 4x = -23
4x = -23 + 19
4x = -4 / :4
x = -1
8x - 9 = 1
8x = 1 + 9
8x = 10 / :8
x = 1 1/4
40 - 6x = 28
40 - 28 = 6x
12 = 6x / :6
2 = x
x = 2