-7(r+4)+5(4r-2)=40

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Solution for -7(r+4)+5(4r-2)=40 equation:


Simplifying
-7(r + 4) + 5(4r + -2) = 40

Reorder the terms:
-7(4 + r) + 5(4r + -2) = 40
(4 * -7 + r * -7) + 5(4r + -2) = 40
(-28 + -7r) + 5(4r + -2) = 40

Reorder the terms:
-28 + -7r + 5(-2 + 4r) = 40
-28 + -7r + (-2 * 5 + 4r * 5) = 40
-28 + -7r + (-10 + 20r) = 40

Reorder the terms:
-28 + -10 + -7r + 20r = 40

Combine like terms: -28 + -10 = -38
-38 + -7r + 20r = 40

Combine like terms: -7r + 20r = 13r
-38 + 13r = 40

Solving
-38 + 13r = 40

Solving for variable 'r'.

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

Add '38' to each side of the equation.
-38 + 38 + 13r = 40 + 38

Combine like terms: -38 + 38 = 0
0 + 13r = 40 + 38
13r = 40 + 38

Combine like terms: 40 + 38 = 78
13r = 78

Divide each side by '13'.
r = 6

Simplifying
r = 6

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