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Simplifying 15 + -9(9 + 4a) = 42 15 + (9 * -9 + 4a * -9) = 42 15 + (-81 + -36a) = 42 Combine like terms: 15 + -81 = -66 -66 + -36a = 42 Solving -66 + -36a = 42 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '66' to each side of the equation. -66 + 66 + -36a = 42 + 66 Combine like terms: -66 + 66 = 0 0 + -36a = 42 + 66 -36a = 42 + 66 Combine like terms: 42 + 66 = 108 -36a = 108 Divide each side by '-36'. a = -3 Simplifying a = -3
| 9n= | | 3x+5=7-2x | | 36-n= | | 14-3(9+h)=8 | | 28=g+14 | | 11-9w=11-9w | | -6(t+8)=18 | | 2x+15=4x-33 | | 3x+5=7+2x | | x^2+2x+1=7x-5 | | 4x-x=7*2 | | 15-3n=n-2 | | 6x+5y=7 | | -2x+y=9 | | e+21=24 | | x-10=141 | | 3x^2+5x+2= | | u^2-6u+1=0 | | u^2-6+1=0 | | 33+26x=33+26x | | x+3x-16+2x+10=90 | | 16z+43=43-16z | | n+6.2= | | 13x^2-32x+28=0 | | .49x+.77(140-x)=.69(140) | | 44.7-n= | | 18n= | | -16z-16=4z+2 | | 2r^2+3r=9 | | .49x+77(140-x)=.69(140) | | (x+4)(3x-2)= | | 144=r+52 |