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Answer:
3x -y = -7
Step-by-step explanation:
"Standard form" is ...
ax +by = c
where a, b, c are mutually prime integers, and a ≥ 0. If a = 0, then b > 0.
Here, we can get standard form by subtracting y+7 from both sides of the equation.
y -(y+7) = 3x +7 -(y+7)
-7 = 3x -y
3x -y = -7
