Combine like terms (3x-2y+z)+(5z-8x-5y)+(-15x+8z)

Solve the equation for x.3(6x - 1) = 12 i've tried doing the math and i can't find out what i'm doing wrong

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Need same math paper but the back now i hope your able to read it cleary i need with hw