21(5)-7x=3(x+1)

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Solution for 21(5)-7x=3(x+1) equation:


Simplifying
21(5) + -7x = 3(x + 1)

Multiply 21 * 5
105 + -7x = 3(x + 1)

Reorder the terms:
105 + -7x = 3(1 + x)
105 + -7x = (1 * 3 + x * 3)
105 + -7x = (3 + 3x)

Solving
105 + -7x = 3 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
105 + -7x + -3x = 3 + 3x + -3x

Combine like terms: -7x + -3x = -10x
105 + -10x = 3 + 3x + -3x

Combine like terms: 3x + -3x = 0
105 + -10x = 3 + 0
105 + -10x = 3

Add '-105' to each side of the equation.
105 + -105 + -10x = 3 + -105

Combine like terms: 105 + -105 = 0
0 + -10x = 3 + -105
-10x = 3 + -105

Combine like terms: 3 + -105 = -102
-10x = -102

Divide each side by '-10'.
x = 10.2

Simplifying
x = 10.2

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