Depends of what the twenty something is. But i can help a bit.
=> 20ish + 5x = 35
{take 20ish from both sides of the equation}
=> 5x = 35 - 20ish
{divide both sides of the equation by 5}
=> x = (35 -20ish) /5
Just replace the 20ish with the exacty number and do the calcuation e.g. if it was exactly 20 the x = (35 - 20) / 5 = 15/5 = 3.
34 plus 1 equals 35
140
Subtract 26 from each side: x = -61
3,457 plus 35 equals 3,492.
31 plus four is 35.
35
35
15 + 35 = 50
65+35 = 100
105
190
123