10x+21(x-3)=402

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Solution for 10x+21(x-3)=402 equation:


Simplifying
10x + 21(x + -3) = 402

Reorder the terms:
10x + 21(-3 + x) = 402
10x + (-3 * 21 + x * 21) = 402
10x + (-63 + 21x) = 402

Reorder the terms:
-63 + 10x + 21x = 402

Combine like terms: 10x + 21x = 31x
-63 + 31x = 402

Solving
-63 + 31x = 402

Solving for variable 'x'.

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

Add '63' to each side of the equation.
-63 + 63 + 31x = 402 + 63

Combine like terms: -63 + 63 = 0
0 + 31x = 402 + 63
31x = 402 + 63

Combine like terms: 402 + 63 = 465
31x = 465

Divide each side by '31'.
x = 15

Simplifying
x = 15

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