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Simplifying 21 + -7x = 7(-3 + -7x) 21 + -7x = (-3 * 7 + -7x * 7) 21 + -7x = (-21 + -49x) Solving 21 + -7x = -21 + -49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49x' to each side of the equation. 21 + -7x + 49x = -21 + -49x + 49x Combine like terms: -7x + 49x = 42x 21 + 42x = -21 + -49x + 49x Combine like terms: -49x + 49x = 0 21 + 42x = -21 + 0 21 + 42x = -21 Add '-21' to each side of the equation. 21 + -21 + 42x = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 42x = -21 + -21 42x = -21 + -21 Combine like terms: -21 + -21 = -42 42x = -42 Divide each side by '42'. x = -1 Simplifying x = -1
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