-3(r-1)+5(3-7r)=-20

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Solution for -3(r-1)+5(3-7r)=-20 equation:


Simplifying
-3(r + -1) + 5(3 + -7r) = -20

Reorder the terms:
-3(-1 + r) + 5(3 + -7r) = -20
(-1 * -3 + r * -3) + 5(3 + -7r) = -20
(3 + -3r) + 5(3 + -7r) = -20
3 + -3r + (3 * 5 + -7r * 5) = -20
3 + -3r + (15 + -35r) = -20

Reorder the terms:
3 + 15 + -3r + -35r = -20

Combine like terms: 3 + 15 = 18
18 + -3r + -35r = -20

Combine like terms: -3r + -35r = -38r
18 + -38r = -20

Solving
18 + -38r = -20

Solving for variable 'r'.

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

Add '-18' to each side of the equation.
18 + -18 + -38r = -20 + -18

Combine like terms: 18 + -18 = 0
0 + -38r = -20 + -18
-38r = -20 + -18

Combine like terms: -20 + -18 = -38
-38r = -38

Divide each side by '-38'.
r = 1

Simplifying
r = 1

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