7(3x+4)-8(2x+5)=13

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Solution for 7(3x+4)-8(2x+5)=13 equation:


Simplifying
7(3x + 4) + -8(2x + 5) = 13

Reorder the terms:
7(4 + 3x) + -8(2x + 5) = 13
(4 * 7 + 3x * 7) + -8(2x + 5) = 13
(28 + 21x) + -8(2x + 5) = 13

Reorder the terms:
28 + 21x + -8(5 + 2x) = 13
28 + 21x + (5 * -8 + 2x * -8) = 13
28 + 21x + (-40 + -16x) = 13

Reorder the terms:
28 + -40 + 21x + -16x = 13

Combine like terms: 28 + -40 = -12
-12 + 21x + -16x = 13

Combine like terms: 21x + -16x = 5x
-12 + 5x = 13

Solving
-12 + 5x = 13

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 5x = 13 + 12

Combine like terms: -12 + 12 = 0
0 + 5x = 13 + 12
5x = 13 + 12

Combine like terms: 13 + 12 = 25
5x = 25

Divide each side by '5'.
x = 5

Simplifying
x = 5

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