To isolate the \(10x\) term and get rid of the \(60\) on the left side, you should subtract 60 from both sides of the equation.
Here's how the next step would look:
Starting with: \[ 60 + 10x = 90 \]
You subtract \(60\): \[ 60 + 10x - 60 = 90 - 60 \] This simplifies to: \[ 10x = 30 \]
Now, the \(60\) is gone, and the equation is simplified so that the \(x\) term is isolated on the left.