Evaluating Algebraic Expressions

Simplify or evaluate the expressions!

1) Solve
3x + 1x = 4
2) Solve
3x + 9x = 6
3) Solve
3x + 5x = 3
4) Solve
4x + 2x = 6
5) Solve
5x + 6x = 5
6) Solve
2x + 6x = 5
7) Solve
4x + 7x = 4
8) Solve
2x + 6x = 5
9) Solve
3x + 9x = 6
10) Solve
5x + 2x = 6
11) Solve
5x + 1x = 3
12) Solve
2x + 8x = 3
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