alleryStart learning →Solve: 7x + 8 = -13.
Ax = -30
Bx = 3
Cx = -21
Dx = -3
Answer & Solution
Correct answer: D. x = -3
1. The left side is chosen as the variable side, so 8 is out of place there.
2. Subtract 8 from both sides: 7x equals -21.
3. Divide both sides by 7 to get x equals -3.
4. Check: 7 times -3, plus 8, equals -21 plus 8, which equals -13.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 2 "Solving Linear Equations and Inequalities", section 2.3 Solve Equations with Variables and Constants on Both Sides_
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