3[-(2+5)]+3x=-(2+1)

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Solution for 3[-(2+5)]+3x=-(2+1) equation:


Simplifying
3[-1(2 + 5)] + 3x = -1(2 + 1)

Combine like terms: 2 + 5 = 7
3[-1(7)] + 3x = -1(2 + 1)

Multiply -1 * 7
3[-7] + 3x = -1(2 + 1)

Multiply 3 * -7
-21 + 3x = -1(2 + 1)

Combine like terms: 2 + 1 = 3
-21 + 3x = -1(3)

Multiply -1 * 3
-21 + 3x = -3

Solving
-21 + 3x = -3

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 3x = -3 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = -3 + 21
3x = -3 + 21

Combine like terms: -3 + 21 = 18
3x = 18

Divide each side by '3'.
x = 6

Simplifying
x = 6

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