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1) 2x + 3 = 1
2x = 1 - 3
x = -22
x = -1
2) -4x + 6 = -2x
-4x + 2x = -6
-2x = -6
x = -6-2
x = 3
3) 6 + 4x = 2x + 11
4x - 2x = 11 - 6
2x = 5
x = 52
x = 2,5
4) 4(3 - x) = 2x + 6
12 - 4x = 2x + 6
-4x - 2x = 6 - 12
-6x = -6
x = -6-6
x = 1
5) 7 + 3(2x + 1) = 40
7 + 6x + 3 = 40
6x = 40 - 7 - 3
6x = 30
x = 306
x = 5