21(10)=x+5(x+5+x+4)

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Solution for 21(10)=x+5(x+5+x+4) equation:


Simplifying
21(10) = x + 5(x + 5 + x + 4)

Multiply 21 * 10
210 = x + 5(x + 5 + x + 4)

Reorder the terms:
210 = x + 5(5 + 4 + x + x)

Combine like terms: 5 + 4 = 9
210 = x + 5(9 + x + x)

Combine like terms: x + x = 2x
210 = x + 5(9 + 2x)
210 = x + (9 * 5 + 2x * 5)
210 = x + (45 + 10x)

Reorder the terms:
210 = 45 + x + 10x

Combine like terms: x + 10x = 11x
210 = 45 + 11x

Solving
210 = 45 + 11x

Solving for variable 'x'.

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

Add '-11x' to each side of the equation.
210 + -11x = 45 + 11x + -11x

Combine like terms: 11x + -11x = 0
210 + -11x = 45 + 0
210 + -11x = 45

Add '-210' to each side of the equation.
210 + -210 + -11x = 45 + -210

Combine like terms: 210 + -210 = 0
0 + -11x = 45 + -210
-11x = 45 + -210

Combine like terms: 45 + -210 = -165
-11x = -165

Divide each side by '-11'.
x = 15

Simplifying
x = 15

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