Answer:
Solve for x:
3x - 4 + x = 21
Collect like terms.
4x - 4 = 21
Move -4 to the right-hand side and change its sign.
4x = 21 + 4
Calculate the sum.
4x = 25
Divide both sides by 4.
x = 25/4
x ≈ 6.25
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Answers & Comments
Answer:
Solve for x:
3x - 4 + x = 21
Collect like terms.
4x - 4 = 21
Move -4 to the right-hand side and change its sign.
4x = 21 + 4
Calculate the sum.
4x = 25
Divide both sides by 4.
x = 25/4
x ≈ 6.25