Answer:
x = 14
Step-by-step explanation:
4x + (2x + 6) = 90
6x + 6 = 90
subtract both sides by 6:
6x + 6 - 6 = 90 - 6
6x = 84
divide both sides by 6
6x/6 = 84/6
double check:
4*14 + (2*14 + 6) = 90
56 + 28 + 6 = 90
Have a nice day!
