3(2x-1)+4(x+1)=21

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Solution for 3(2x-1)+4(x+1)=21 equation: 


Simplifying
3(2x + -1) + 4(x + 1) = 21

Reorder the terms:
3(-1 + 2x) + 4(x + 1) = 21
(-1 * 3 + 2x * 3) + 4(x + 1) = 21
(-3 + 6x) + 4(x + 1) = 21

Reorder the terms:
-3 + 6x + 4(1 + x) = 21
-3 + 6x + (1 * 4 + x * 4) = 21
-3 + 6x + (4 + 4x) = 21

Reorder the terms:
-3 + 4 + 6x + 4x = 21

Combine like terms: -3 + 4 = 1
1 + 6x + 4x = 21

Combine like terms: 6x + 4x = 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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