2(x + 7) + x = 20
Distribute 2 inside the parentheses.
2x + 14 + x = 20
Combine like terms.
3x + 14 = 20
Subtract 14 from both sides.
3x = 6
Divide both sides by 3.
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Answer:
Step-by-step explanation:
The given inequality is
Add 4 to both sides of the first inequality and subtract 5 from both sides of the second inequality.
We simplify to get:
Divide through the first inequality by 4 and the second by 9.
Using a Laplace expansion along the first column, we have
The determinant of a 2x2 matrix is trivial,
So we have