4x+5[3+x]=87

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Solution for 4x+5[3+x]=87 equation:


Simplifying
4x + 5[3 + x] = 87
4x + [3 * 5 + x * 5] = 87
4x + [15 + 5x] = 87

Reorder the terms:
15 + 4x + 5x = 87

Combine like terms: 4x + 5x = 9x
15 + 9x = 87

Solving
15 + 9x = 87

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 9x = 87 + -15

Combine like terms: 15 + -15 = 0
0 + 9x = 87 + -15
9x = 87 + -15

Combine like terms: 87 + -15 = 72
9x = 72

Divide each side by '9'.
x = 8

Simplifying
x = 8

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