[3x+7]+[4x-15]=90

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Solution for [3x+7]+[4x-15]=90 equation:


Simplifying
[3x + 7] + [4x + -15] = 90

Reorder the terms:
[7 + 3x] + [4x + -15] = 90

Remove brackets around [7 + 3x]
7 + 3x + [4x + -15] = 90

Reorder the terms:
7 + 3x + [-15 + 4x] = 90

Remove brackets around [-15 + 4x]
7 + 3x + -15 + 4x = 90

Reorder the terms:
7 + -15 + 3x + 4x = 90

Combine like terms: 7 + -15 = -8
-8 + 3x + 4x = 90

Combine like terms: 3x + 4x = 7x
-8 + 7x = 90

Solving
-8 + 7x = 90

Solving for variable 'x'.

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

Add '8' to each side of the equation.
-8 + 8 + 7x = 90 + 8

Combine like terms: -8 + 8 = 0
0 + 7x = 90 + 8
7x = 90 + 8

Combine like terms: 90 + 8 = 98
7x = 98

Divide each side by '7'.
x = 14

Simplifying
x = 14

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