189=21*3+2x

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Solution for 189=21*3+2x equation:


Simplifying
189 = 21 * 3 + 2x

Multiply 21 * 3
189 = 63 + 2x

Solving
189 = 63 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
189 + -2x = 63 + 2x + -2x

Combine like terms: 2x + -2x = 0
189 + -2x = 63 + 0
189 + -2x = 63

Add '-189' to each side of the equation.
189 + -189 + -2x = 63 + -189

Combine like terms: 189 + -189 = 0
0 + -2x = 63 + -189
-2x = 63 + -189

Combine like terms: 63 + -189 = -126
-2x = -126

Divide each side by '-2'.
x = 63

Simplifying
x = 63

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