95. Упростите выражение:
1) 2x + 3x;
3) 5у + 9у;
5) x+4х + 5x;
2) 7x – 4x;
4) бу – у;
6) 8х + 3x – х;
7) 10x + 7х – 8x;
8) 9y + 2y — 4у.
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