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Mathematics , 23.06.2022 21:57

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Answered by an experienced expert nasty0541

Answer and explanation:
1) 3w+7=19;
3w=19-7;
3w=12;
w=12/3;
w=4.
2) 9/3+4=6 - invalid expression, since 9/3=3, hence 3+4=7 and cannot be equal to 6.
3) -3=12y-5(2y-7);
-3=12y+(-5)*2y+(-5)*(-7);
-3=12y-10y+35;
-3=2y+35;
2y=-3-35;
2y=-38;
y=-38/2;
y=-19.

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