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Simplifying 0.8(4y + -9) + -1.9y = 0.8(4y) + -0.8(9) + -1.9y Reorder the terms: 0.8(-9 + 4y) + -1.9y = 0.8(4y) + -0.8(9) + -1.9y (-9 * 0.8 + 4y * 0.8) + -1.9y = 0.8(4y) + -0.8(9) + -1.9y (-7.2 + 3.2y) + -1.9y = 0.8(4y) + -0.8(9) + -1.9y Combine like terms: 3.2y + -1.9y = 1.3y -7.2 + 1.3y = 0.8(4y) + -0.8(9) + -1.9y Remove parenthesis around (4y) -7.2 + 1.3y = 0.8 * 4y + -0.8(9) + -1.9y Multiply 0.8 * 4 -7.2 + 1.3y = 3.2y + -0.8(9) + -1.9y Multiply -0.8 * 9 -7.2 + 1.3y = 3.2y + -7.2 + -1.9y Reorder the terms: -7.2 + 1.3y = -7.2 + 3.2y + -1.9y Combine like terms: 3.2y + -1.9y = 1.3y -7.2 + 1.3y = -7.2 + 1.3y Add '7.2' to each side of the equation. -7.2 + 7.2 + 1.3y = -7.2 + 7.2 + 1.3y Combine like terms: -7.2 + 7.2 = 0.0 0.0 + 1.3y = -7.2 + 7.2 + 1.3y 1.3y = -7.2 + 7.2 + 1.3y Combine like terms: -7.2 + 7.2 = 0.0 1.3y = 0.0 + 1.3y 1.3y = 1.3y Add '-1.3y' to each side of the equation. 1.3y + -1.3y = 1.3y + -1.3y Combine like terms: 1.3y + -1.3y = 0.0 0.0 = 1.3y + -1.3y Combine like terms: 1.3y + -1.3y = 0.0 0.0 = 0.0 Solving 0.0 = 0.0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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