7x-3=2x+18

7x-3=2x+18

7x-2x=18+3
5x=21
x=21/5

In class, the teacher gave you such a question: "given that 5a-2x + 3 = 0, 4b-7x-21 = 0, find the value range of X

Wool, it's the answer of value range: 5a-2x + 3 + 0, a = 2x-3, B = 21 + 7x / 4, because a < 6 ≤ B, so 2x-3 / 5 < 6 ≤ 21 + 7x / 4, so 3 / 7 < x ≤ 16.5
Remember to adopt it

In class, the teacher gave you a question like this, known as 5a-2x + 3 = 0
Given that 5a-2x + 3 = 0, 4b-7x-21 = 0, a is less than 6 and less than or equal to B, find the value range of X

5a-2x+3=0
4b-7x-21=0
A = (2x-3) / 5, B = (7x + 21) / 4
Because: a