(12y+30)-(1,4-0,7y)

To simplify the expression \((12y + 30) - (1.4 - 0.7y)\), follow these steps:

1. Distribute the negative sign: \[ 12y + 30 - 1.4 + 0.7y \]

2. Combine like terms:

   • Combine \(12y\) and \(0.7y\): \[ 12y + 0.7y = 12.7y \]
   • Combine the constant terms \(30\) and \(-1.4\): \[ 30 - 1.4 = 28.6 \]

Putting it all together, the simplified expression is: \[ 12.7y + 28.6 \]