28r+42-7(5r+9)=

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Solution for 28r+42-7(5r+9)= equation:


Simplifying
28r + 42 + -7(5r + 9) = 0

Reorder the terms:
28r + 42 + -7(9 + 5r) = 0
28r + 42 + (9 * -7 + 5r * -7) = 0
28r + 42 + (-63 + -35r) = 0

Reorder the terms:
42 + -63 + 28r + -35r = 0

Combine like terms: 42 + -63 = -21
-21 + 28r + -35r = 0

Combine like terms: 28r + -35r = -7r
-21 + -7r = 0

Solving
-21 + -7r = 0

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + -7r = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -7r = 0 + 21
-7r = 0 + 21

Combine like terms: 0 + 21 = 21
-7r = 21

Divide each side by '-7'.
r = -3

Simplifying
r = -3

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