Решите уравнения: 2x + 3 = 15, 4 - x = 5x + 22, 5y + 18 = 8y и другие.

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**Ответ:** 1. $2x + 3 = 15$ $2x = 15 - 3$ $2x = 12$ $x = 6$ 2. $4 - x = 5x + 22$ $-x - 5x = 22 - 4$ $-6x = 18$ $x = -3$ 3. $5y + 18 = 8y$ $18 = 8y - 5y$ $18 = 3y$ $y = 6$ 4. $16 - 2x = 3x$ $16 = 3x + 2x$ $16 = 5x$ $x = 3,2$ 5. $42 - 2x = 5x$ $42 = 5x + 2x$ $42 = 7x$ $x = 6$ 6. $3x + 18 = 5x$ $18 = 5x - 3x$ $18 = 2x$ $x = 9$ 7. $5y - 22 = 3y$ $5y - 3y = 22$ $2y = 22$ $y = 11$ 8. $3x + 38 = 5x + 18$ $38 - 18 = 5x - 3x$ $20 = 2x$ $x = 10$ 9. $7y - 5 = 3y + 3$ $7y - 3y = 3 + 5$ $4y = 8$ $y = 2$ 10. $6x - 45 = 2x - 17$ $6x - 2x = 45 - 17$ $4x = 28$ $x = 7$ 11. $3 - 3y = 7 - 13y$ $-3y + 13y = 7 - 3$ $10y = 4$ $y = 0,4$ 12. $3x - 2 = 7 - x$ $3x + x = 7 + 2$ $4x = 9$ $x = 2,25$

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