Evaluating Algebraic Expressions

Simplify or evaluate the expressions!

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