3у+6у+78=1617

To solve this equation, we will combine like terms and isolate the variable: 3у + 6у + 78 = 1617

Combining like terms, we have: 9у + 78 = 1617

Next, we will isolate the variable у by subtracting 78 from both sides: 9у = 1617 - 78 9у = 1539

Finally, we will divide both sides of the equation by 9 to solve for у: у = 1539 / 9 у = 171

Therefore, the solution to the equation 3у + 6у + 78 = 1617 is у = 171.