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Simplifying -148 = 4(-9 + -4r) -148 = (-9 * 4 + -4r * 4) -148 = (-36 + -16r) Solving -148 = -36 + -16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16r' to each side of the equation. -148 + 16r = -36 + -16r + 16r Combine like terms: -16r + 16r = 0 -148 + 16r = -36 + 0 -148 + 16r = -36 Add '148' to each side of the equation. -148 + 148 + 16r = -36 + 148 Combine like terms: -148 + 148 = 0 0 + 16r = -36 + 148 16r = -36 + 148 Combine like terms: -36 + 148 = 112 16r = 112 Divide each side by '16'. r = 7 Simplifying r = 7
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