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Answer:
1) -6
2) x = -y +7 if you set all terms equal to zero.
Step-by-step explanation:
1) Isolate x by dividing -42 by 7. x = -6
2) Set the entire expression equal to zero.
x + y -7 = 0
Isolate x on one side of the equation. Remember to change signs when moving terms across the equal sign.
x = -y +7 if the original expression is set equal to zero.