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3x -2 + 7x = 7-1
10x -2 = 6
10x = 8
x = 4/5
2.
8x + 12 - 2x = 4x + 20
6x - 4x =20 - 12
2x = 8 =====> x = 4
3.
34 = 5x - 6
34 + 6 = 5x
40 = 5x
8 = x