25x - 12 = 3 + 20x
25x - 20x = 3 + 12
5x = 15
x = 15/3
x = 3
4t - 1 = 5 - 2t
4t + 2t = 5 + 1
6t = 6
t = 6/6
t = 1
10 + 12y = 7y - 5
12y - 7y = -5 - 10
5y = -15
y = -15/5
y = -3
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25x - 12 = 3 + 20x
25x - 20x = 3 + 12
5x = 15
x = 15/3
x = 3
4t - 1 = 5 - 2t
4t + 2t = 5 + 1
6t = 6
t = 6/6
t = 1
10 + 12y = 7y - 5
12y - 7y = -5 - 10
5y = -15
y = -15/5
y = -3