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

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


Simplifying
4(7 + 5r) + -1(2r + -4) = -40
(7 * 4 + 5r * 4) + -1(2r + -4) = -40
(28 + 20r) + -1(2r + -4) = -40

Reorder the terms:
28 + 20r + -1(-4 + 2r) = -40
28 + 20r + (-4 * -1 + 2r * -1) = -40
28 + 20r + (4 + -2r) = -40

Reorder the terms:
28 + 4 + 20r + -2r = -40

Combine like terms: 28 + 4 = 32
32 + 20r + -2r = -40

Combine like terms: 20r + -2r = 18r
32 + 18r = -40

Solving
32 + 18r = -40

Solving for variable 'r'.

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

Add '-32' to each side of the equation.
32 + -32 + 18r = -40 + -32

Combine like terms: 32 + -32 = 0
0 + 18r = -40 + -32
18r = -40 + -32

Combine like terms: -40 + -32 = -72
18r = -72

Divide each side by '18'.
r = -4

Simplifying
r = -4

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