15(r-2)-4(r+4)=7

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Solution for 15(r-2)-4(r+4)=7 equation:


Simplifying
15(r + -2) + -4(r + 4) = 7

Reorder the terms:
15(-2 + r) + -4(r + 4) = 7
(-2 * 15 + r * 15) + -4(r + 4) = 7
(-30 + 15r) + -4(r + 4) = 7

Reorder the terms:
-30 + 15r + -4(4 + r) = 7
-30 + 15r + (4 * -4 + r * -4) = 7
-30 + 15r + (-16 + -4r) = 7

Reorder the terms:
-30 + -16 + 15r + -4r = 7

Combine like terms: -30 + -16 = -46
-46 + 15r + -4r = 7

Combine like terms: 15r + -4r = 11r
-46 + 11r = 7

Solving
-46 + 11r = 7

Solving for variable 'r'.

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

Add '46' to each side of the equation.
-46 + 46 + 11r = 7 + 46

Combine like terms: -46 + 46 = 0
0 + 11r = 7 + 46
11r = 7 + 46

Combine like terms: 7 + 46 = 53
11r = 53

Divide each side by '11'.
r = 4.818181818

Simplifying
r = 4.818181818

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