X-(4s-7)=5s-(s+21)

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Solution for X-(4s-7)=5s-(s+21) equation:


Simplifying
X + -1(4s + -7) = 5s + -1(s + 21)

Reorder the terms:
X + -1(-7 + 4s) = 5s + -1(s + 21)
X + (-7 * -1 + 4s * -1) = 5s + -1(s + 21)
X + (7 + -4s) = 5s + -1(s + 21)

Reorder the terms:
7 + X + -4s = 5s + -1(s + 21)

Reorder the terms:
7 + X + -4s = 5s + -1(21 + s)
7 + X + -4s = 5s + (21 * -1 + s * -1)
7 + X + -4s = 5s + (-21 + -1s)

Reorder the terms:
7 + X + -4s = -21 + 5s + -1s

Combine like terms: 5s + -1s = 4s
7 + X + -4s = -21 + 4s

Solving
7 + X + -4s = -21 + 4s

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + X + -7 + -4s = -21 + -7 + 4s

Reorder the terms:
7 + -7 + X + -4s = -21 + -7 + 4s

Combine like terms: 7 + -7 = 0
0 + X + -4s = -21 + -7 + 4s
X + -4s = -21 + -7 + 4s

Combine like terms: -21 + -7 = -28
X + -4s = -28 + 4s

Add '4s' to each side of the equation.
X + -4s + 4s = -28 + 4s + 4s

Combine like terms: -4s + 4s = 0
X + 0 = -28 + 4s + 4s
X = -28 + 4s + 4s

Combine like terms: 4s + 4s = 8s
X = -28 + 8s

Simplifying
X = -28 + 8s

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