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Simplifying 5(x + 3) + 2(x + -4) = 21 Reorder the terms: 5(3 + x) + 2(x + -4) = 21 (3 * 5 + x * 5) + 2(x + -4) = 21 (15 + 5x) + 2(x + -4) = 21 Reorder the terms: 15 + 5x + 2(-4 + x) = 21 15 + 5x + (-4 * 2 + x * 2) = 21 15 + 5x + (-8 + 2x) = 21 Reorder the terms: 15 + -8 + 5x + 2x = 21 Combine like terms: 15 + -8 = 7 7 + 5x + 2x = 21 Combine like terms: 5x + 2x = 7x 7 + 7x = 21 Solving 7 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 7x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 7x = 21 + -7 7x = 21 + -7 Combine like terms: 21 + -7 = 14 7x = 14 Divide each side by '7'. x = 2 Simplifying x = 2
| 9x=49 | | 9=49 | | x^4+2x^2+8=0 | | 0-2y=24 | | 0.5(x+20)+0.7x=46 | | 27=4(2-3y)+7 | | 17=.66n+3 | | 27=4(2-3)+7 | | 4+2X-X=7 | | 9x+3=9x-3 | | -9x+8=-10 | | 3x^2-3= | | 20=-4(x-2) | | (2a^3+a-7)-(6-7a^3-9a^2)= | | 4x+2+3=2x+5+2x | | 0=3x^2-12x+3 | | 4a-(a+2a)= | | 3/8*4/8= | | 8(x-1)=-4(2-x)+4x | | 8(x-1)=-4(2-x)+4c | | 5*(9+x)x^2-(9x+8)*8=3x | | x-9-3x-3-2x=0 | | 14-10x=134-31x | | 7x+6y=20 | | x^2-(9x+8)*8=3x | | x-(9x+8)*8=3x | | 4a-2=30 | | 4d^3-81d=0 | | 0.4X+2=3 | | -13x+23=88 | | 8Y-4Y=24 | | 49d^3-81d=0 |