3(x+21)+4(x+28)=28

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Solution for 3(x+21)+4(x+28)=28 equation: 


Simplifying
3(x + 21) + 4(x + 28) = 28

Reorder the terms:
3(21 + x) + 4(x + 28) = 28
(21 * 3 + x * 3) + 4(x + 28) = 28
(63 + 3x) + 4(x + 28) = 28

Reorder the terms:
63 + 3x + 4(28 + x) = 28
63 + 3x + (28 * 4 + x * 4) = 28
63 + 3x + (112 + 4x) = 28

Reorder the terms:
63 + 112 + 3x + 4x = 28

Combine like terms: 63 + 112 = 175
175 + 3x + 4x = 28

Combine like terms: 3x + 4x = 7x
175 + 7x = 28

Solving
175 + 7x = 28

Solving for variable 'x'.

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

Add '-175' to each side of the equation.
175 + -175 + 7x = 28 + -175

Combine like terms: 175 + -175 = 0
0 + 7x = 28 + -175
7x = 28 + -175

Combine like terms: 28 + -175 = -147
7x = -147

Divide each side by '7'.
x = -21

Simplifying
x = -21

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