12-(4-3x)=21-(12+7x)

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Solution for 12-(4-3x)=21-(12+7x) equation: 


Simplifying
12 + -1(4 + -3x) = 21 + -1(12 + 7x)
12 + (4 * -1 + -3x * -1) = 21 + -1(12 + 7x)
12 + (-4 + 3x) = 21 + -1(12 + 7x)

Combine like terms: 12 + -4 = 8
8 + 3x = 21 + -1(12 + 7x)
8 + 3x = 21 + (12 * -1 + 7x * -1)
8 + 3x = 21 + (-12 + -7x)

Combine like terms: 21 + -12 = 9
8 + 3x = 9 + -7x

Solving
8 + 3x = 9 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
8 + 3x + 7x = 9 + -7x + 7x

Combine like terms: 3x + 7x = 10x
8 + 10x = 9 + -7x + 7x

Combine like terms: -7x + 7x = 0
8 + 10x = 9 + 0
8 + 10x = 9

Add '-8' to each side of the equation.
8 + -8 + 10x = 9 + -8

Combine like terms: 8 + -8 = 0
0 + 10x = 9 + -8
10x = 9 + -8

Combine like terms: 9 + -8 = 1
10x = 1

Divide each side by '10'.
x = 0.1

Simplifying
x = 0.1

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