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Simplifying 3(a + -7) + -2a + 9 = 15 Reorder the terms: 3(-7 + a) + -2a + 9 = 15 (-7 * 3 + a * 3) + -2a + 9 = 15 (-21 + 3a) + -2a + 9 = 15 Reorder the terms: -21 + 9 + 3a + -2a = 15 Combine like terms: -21 + 9 = -12 -12 + 3a + -2a = 15 Combine like terms: 3a + -2a = 1a -12 + 1a = 15 Solving -12 + 1a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 1a = 15 + 12 Combine like terms: -12 + 12 = 0 0 + 1a = 15 + 12 1a = 15 + 12 Combine like terms: 15 + 12 = 27 1a = 27 Divide each side by '1'. a = 27 Simplifying a = 27
| 2=21+b | | 30+0.19x=87 | | 10y-8=2y-14 | | 4s^2+8s+9=0 | | 75=110e^30x | | -3b+(-4)=-4 | | (x^2+2xy-y^2)dx-(x^2-2xy-y^2)dy=0 | | 172x=2000 | | 1=2+2 | | 5=-7.2x+0.8x^2 | | 5=0.8x(x-9) | | -5.4x=-0.648 | | f[x]=10x+3 | | 5sqrt(x)+4sqrt(y)=11 | | x+2.6=7.28 | | 5x-90=25 | | v-9+5v=0 | | -6.2x=0.0186 | | 18x^2y^7+20x^10y^3+16x^9y^6= | | 7t+9r-3= | | -5(2+r)=3(2+r) | | 21.5=4.3c | | 3(n+3)=25+n | | 2x+13=4x+1 | | .3x^2=1.8x+0.3 | | 7a-7a=16+4a | | (5-3d)-(8+5d)=5 | | 3p^2=10p-3 | | 24-x=12+3x | | 9x+3=4x+15 | | 0=.06v^2+2v-250 | | -93=-5(3x+2)+7 |