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Simplifying (-30(-7)) + -1(210(-3)) = x Multiply -30 * -7 (210) + -1(210(-3)) = x 210 + -1(210(-3)) = x Multiply 210 * -3 210 + -1(-630) = x Multiply -1 * -630 210 + 630 = x Combine like terms: 210 + 630 = 840 840 = x Solving 840 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 840 + -1x = x + -1x Combine like terms: x + -1x = 0 840 + -1x = 0 Add '-840' to each side of the equation. 840 + -840 + -1x = 0 + -840 Combine like terms: 840 + -840 = 0 0 + -1x = 0 + -840 -1x = 0 + -840 Combine like terms: 0 + -840 = -840 -1x = -840 Divide each side by '-1'. x = 840 Simplifying x = 840
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