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

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Solution for 7(x+1)+3(x-2)=21 equation:


Simplifying
7(x + 1) + 3(x + -2) = 21

Reorder the terms:
7(1 + x) + 3(x + -2) = 21
(1 * 7 + x * 7) + 3(x + -2) = 21
(7 + 7x) + 3(x + -2) = 21

Reorder the terms:
7 + 7x + 3(-2 + x) = 21
7 + 7x + (-2 * 3 + x * 3) = 21
7 + 7x + (-6 + 3x) = 21

Reorder the terms:
7 + -6 + 7x + 3x = 21

Combine like terms: 7 + -6 = 1
1 + 7x + 3x = 21

Combine like terms: 7x + 3x = 10x
1 + 10x = 21

Solving
1 + 10x = 21

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 10x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 10x = 21 + -1
10x = 21 + -1

Combine like terms: 21 + -1 = 20
10x = 20

Divide each side by '10'.
x = 2

Simplifying
x = 2

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