3(5х+7)=6

To solve the equation \( 3(5x + 7) = 6 \), follow these steps:

1. Distribute the 3 on the left side of the equation: \[ 15x + 21 = 6 \]

2. Subtract 21 from both sides: \[ 15x = 6 - 21 \] \[ 15x = -15 \]

3. Divide both sides by 15 to solve for \( x \): \[ x = \frac{-15}{15} \] \[ x = -1 \]

So, the solution is \( x = -1 \).