Solve this question? 7x - 3x + 7 = 3 (x - 4) + 20

7x - 3x + 7 = 3 (x - 4) + 20

⇔ 4x + 7 = 3x - 12 + 20

⇔ 4x - 3x = 8 - 7

⇔ x = 1

X=1

To solve this you start by adding like terms on the left side and doing the distributive property and adding like terms on the right. This would get you

4x+7=3x+8

Then you minus 3x on both sides getting

x+7=8

Then subtract 7 from both sides getting x=1.