You want the unknowns on one side and everything else on the other side. Let's move the 3 on the right side to the left side. We can do that by adding -3 to both sides.
Remove the parentheses.
Now combine terms.
Now multiply both sides by -1 to get rid of the minus signs (we want to know y, not -y).
6=y or if you prefer
check my work.
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