Помогите решить 2-ве верхние

Question

Помогите решить 2-ве верхние

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Comments

сложно

Answer 1

5x - (4 - 2x) = 8 + 3x
5x - 4 + 2x = 8 + 3x
5x + 2x - 3x = 8 + 4
4x = 12 (:4)
x = 3

7x + 2(-4+x) = 9 - 2x
7x - 8 + 2x = 9 - 2x
7x + 2x + 2x = 9 + 8
11x = 17 (:11)
x = 17/11 (дробь)