Where is the main lesson?

Math as a Language has the full topic, examples, and practice links.

Which calculator first?

After your setup is on paper, open Fraction for a quick numeric pass.

Calculator for math notation: enter the expression or equation you already wrote.

Read Math as a Language, then type what you wrote for math notation. Parentheses and units are the usual sources of mismatch.

Change one input at a time. If the output jumps more than you expected, that input was doing more work in math notation than you thought.

Write 3(x + 2) on paper. Enter it with parentheses so the tool multiplies 3 by the whole sum, not only by x.

Written work
Tool output

Related: Math as a Language. Use the calculator with your own numbers when the example is not close to your case.

Where is the main lesson?: Math as a Language has the full topic, examples, and practice links.
Which calculator first?: After your setup is on paper, open Fraction for a quick numeric pass.